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  • 1.
    Ananthanarayanan, Durga
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Holländer Pettersson, Niklas
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Malladi, Sri Bala Aditya
    Chalmers Univ Technol, Ind & Mat Sci, SE-41296 Gothenburg, Sweden..
    Chen, Zhuoer
    Chalmers Univ Technol, Ind & Mat Sci, SE-41296 Gothenburg, Sweden..
    Guo, Sheng
    Chalmers Univ Technol, Ind & Mat Sci, SE-41296 Gothenburg, Sweden..
    Nyborg, Lars
    Chalmers Univ Technol, Ind & Mat Sci, SE-41296 Gothenburg, Sweden..
    Lindwall, Greta
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Grain refinement in additively manufactured ferritic stainless steel by in situ inoculation using pre-alloyed powder2021Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 194, artikkel-id 113690Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    For ferritic stainless steels, TiN has effectively been used as an inoculant to produce equiaxed grain structures in casting and welding. However, it is not established whether TiN would be an effective inoculant in additive manufacturing. In this study, the effectiveness of TiN as an inoculant in a ferritic stainless steel processed by laser powder-bed fusion is studied. An alloy without Ti is fabricated and compared to an alloy designed to form a high amount of TiN early during solidification. The work shows that the presence of TiN provides general grain refinement and that TiN-covered oxide particles are effective in enabling columnar-to-equiaxed transition in certain regions of the meltpool. The applied approach of pre-alloying powders with inoculant-forming elements offers a straightforward route to achieving fine, equiaxed grain structures in additively manufactured metallic materials. It also shows how oxygen present during the process can be utilized to nucleate effective inoculating phases.

  • 2.
    Baykov, Vitaly
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Jerlerud Perez, Rosa
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Korzhavyi, Pavel A.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Sundman, Bo
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Termodynamisk modellering.
    Johansson, Börje
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad materialfysik.
    Structural stability of intermetallic phases in the Zr-Sn system2006Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 55, nr 5, s. 485-488Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A thermodynamic description of the intermetallic compounds in the Zr-Sn binary system has been obtained using total energy calculations by means of the Vienna ab initio simulation package. Our calculations show that hexagonal compounds Zr5Sn4 and Zr5Sn3 are the most stable phases in the Zr-Sn binary system. Their high stability is found to be due to hybridization of the Sn 5p with Zr 4d electronic states. Based on the calculated energies, the conclusion is made that Zr substitution on the Sri sites takes place in the Zr4Sn phase, which accounts for the unusual stoichiometry of this Cr3Si structure type compound.

  • 3.
    Borgenstam, Annika
    et al.
    KTH, Tidigare Institutioner (före 2005), Materialvetenskap.
    Hillert, Mats
    KTH, Tidigare Institutioner (före 2005), Materialvetenskap.
    Model for nucleation of isothermal martensite2001Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 45, nr 8, s. 917-922Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Kaufman and Cohen's model for thermally activated growth of preexisting embroys of isothermal martensite was defined with a series of obstacles but they only considered jumps in one direction. Jumps in both directions across obstacles were recently considered and the activation energy for the net reaction was described. That nucleation model is now developed further.

  • 4.
    Bu, Junfu
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad processmetallurgi.
    Jönsson, Pär Göran
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Zhao, Zhe
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap. Shanghai Institute of Technology, China.
    Dense and translucent BaZrxCe0.8-xY0.2O3-delta (x=0.5, 0.6, 0.7) proton conductors prepared by spark plasma sintering2015Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 107, s. 145-148Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Dense and translucent BaZrxCe0.8-xY0.2O3-delta (x = 0.5, 0.6, 0.7) proton conductors were firstly and successfully prepared by Spark Plasma Sintering (SPS) at a temperature of 1350 degrees C without sintering aids' addition. XRD, SEM and EDS were applied to determine the phase purity, morphology and element composition of prepared pellets, respectively. Moreover, the sintering behaviors of these proton conductors were monitored and analyzed through the on-line sintering curves. The obtained results indicate that a lowered sintering temperature (<1400 degrees C) and a fast cooling rate (>= 200 degrees C/min) represent two key parameters to prepare dense Ce-containing BaZrO3-BaCeO3 based proton conductors.

  • 5.
    Bu, Junfu
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Jönsson, Pär Göran
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Zhao, Zhe
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap. Shanghai Institute of Technology, China.
    Electrical conductivities of translucent BaZr(X)Ce0.8-XY0.2O3-delta (x=0.5, 0.6, 0.7) ceramics2016Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 115, s. 87-90Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The electrical conductivities of translucent BaZr0.5Ce0.3Y0.2O3-delta (x = 0.5, BZCY532), BaZr0.6Ce0.2Y0.2O3-delta (x = 0.6, BZCY622) and BaZr0.7Ce0.1Y0.2O3-delta(x = 0.7, BZCY712) proton conductors were investigated systematically in different atmospheres and also at different oxygen partial pressures. The obtained results indicate that translucent BZCY532, BZCY622 and BZCY712 ceramics are pure oxygen-ion and proton conductors without unfavorable electronic conduction. In addition, they represent promising proton conductors to be used as intermediate temperature solid oxide fuel cell electrolytes.

  • 6.
    Chen, Kaixuan
    et al.
    aSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, PR China.
    Chen, Yumeng
    aSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, PR China.
    Zhao, Chenyu
    aSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, PR China.
    Zhang, Fanyun
    aSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, PR China.
    Chen, Xiangkai
    aSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, PR China.
    Ming, Kaisheng
    bSchool of Materials Science and Engineering, Hebei University of Technology, Tianjin 300401, PR China.
    Zapolsky, Helena
    cGPM, UMR CNRS 6634, Universitéde Rouen-Normandy, Saint Étienne du Rouvray 76575, France, Saint Étienne du Rouvray.
    Zhu, Yuzhi
    aSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, PR China.
    Chen, Xiaohua
    dState Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, PR China.
    Mao, Huahai
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Strukturer. Thermo-Calc Software AB, Råsundavägen 18A, Solna SE-16967, Sweden, Råsundavägen 18A.
    Wang, Zidong
    aSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, PR China; dState Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, PR China.
    Mapping formation mechanisms and transformation regimes of multiple Fe precipitates in Cu-Fe-Co alloy during casting process2024Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 246, artikkel-id 116078Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Precipitate features including size, morphology, crystal structure, etc., are important parameters determining the performance of precipitate-strengthened alloys. Multiple Fe precipitates were identified in as-cast Cu alloys exhibiting the distinct features, which dramatically influence mechanical properties. However, a complete understanding of precipitation behaviors of Fe particles during casting, in terms of both microscopic kinetics and thermodynamics, remains experimentally challenging. Here, we report the combined implementation of transmission electron microscopy, Thermo-Calc calculations and First-principles calculations to map mechanisms and growth regimes of Fe precipitation in a Cu-Fe-Co system. Our analyses support the idea that to understand the microstructural evolution in the system, both thermodynamic and kinetic arguments must be taken into account. Then, using our multi-approach strategy, the complete picture of the formation and transformation of Fe precipitates is proposed. This work is vital to promote microstructural design for Cu-Fe(-Co) systems, and sheds new insights into understanding of intricate precipitation in alloys.

  • 7.
    Cheng, Q.
    et al.
    Hunan Univ, Coll Mat Sci & Engn, Ctr High Resolut Electron Microscopy, Changsha 410082, Peoples R China..
    Xu, X. D.
    Hunan Univ, Coll Mat Sci & Engn, Ctr High Resolut Electron Microscopy, Changsha 410082, Peoples R China.;Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China..
    Li, Xiaoqing
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Li, Y. P.
    Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China..
    Nieh, T. G.
    Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA..
    Chen, M. W.
    Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21214 USA..
    Solid solution softening in a Aloi CoCrFeMnNi high-entropy alloy2020Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 186, s. 63-68Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Solute effects on high-entropy alloys of equiatomic proportions are scientifically intriguing because there is no such well-defined "solute" and "solvent" atoms compared to those of conventional single principal element alloys. To date, most of the face-centered cubic alloys exhibit solid solution strengthening rather than softening due to the interactions between dislocations and solute atoms. Here, we present the careful experimental measurements and demonstrate solid solution softening, albeit weak, in a single phase CoCrFeMnNi through the minor addition of 2. at.% Al. This softening effect is mostly related to the decreased Peierl's stress by Al addition.

  • 8.
    Dahlström, Alexander
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Danoix, Frederic
    Univ Rouen Normandie, Grp Phys Mat, CNRS, INSA Rouen, F-76000 Rouen, France..
    Hedström, Peter
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Odqvist, Joakim
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Metallografi.
    Zapolsky, Helena
    Univ Rouen Normandie, Grp Phys Mat, CNRS, INSA Rouen, F-76000 Rouen, France..
    Nanostructure in Fe0.65Cr0.35 close to the upper limit of the miscibility gap2020Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 180, s. 62-65Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The nanostructure of an Fe0.65Cr0.35 alloy has been investigated by atom probe tomography after high precision thermal treatments close to the upper limit of the miscibility gap (MG). It is found that the wavelength of the decomposed ferrite between Cr- and Fe-rich regions grows exponentially when approaching the upper limit of the MG. Furthermore, the nanostructure change is gradual with temperature indicating a narrow metastable region and a diffuse transition out of the spinodal regime. Atomistic modelling near the limit of instability further supports the experimental observations. The findings are discussed in relation to the Cahn-Hilliard theory.

  • 9.
    Delczeg-Czirjak, Erna K.
    et al.
    Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120, Uppsala, Sweden, Box 516.
    Eriksson, Olle
    Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120, Uppsala, Sweden, Box 516; School of Science and Technology, Örebro University, SE-701 82 Örebro, Sweden.
    Ruban, Andrei V.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Strukturer. Materials Center Leoben Forschung GmbH, A-8700 Leoben, Austria.
    The effect of longitudinal spin-fluctuations on high temperature properties of Co3Mn2Ge2023Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 226, artikkel-id 115213Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    It is demonstrated that thermally induced longitudinal spin fluctuations (LSF) play an important role in itinerant Co3Mn2Ge at an elevated temperature. The effect of LSF is taken into account during ab initio calculations via a simple model for the corresponding entropy contribution. We show that the magnetic entropy leads to the appearance of a medium size local moment on Co atoms. As a consequence, this leads to a renormalization of the magnetic exchange interactions with a quite substantial impact upon the calculated Curie temperature. Taking LSF into account, the calculated Curie temperature can be brought to be in good agreement with the experimental value.

  • 10.
    Dong, Zhihua
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad materialfysik.
    Li, Wei
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad materialfysik.
    Chai, G.
    Vitos, Levente
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad materialfysik.
    Strong temperature – Dependence of Ni -alloying influence on the stacking fault energy in austenitic stainless steel2020Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 178, s. 438-441Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Using ab initio alloy theory, we calculate the impact of Ni on the stacking fault energy in austenitic stainless steel as a function of temperature. We show that the influence of Ni strongly couples with temperature. While a positive effect on the stacking fault energy is obtained at ambient temperature, the opposite negative effect is disclosed at elevated temperatures. An important rationale behind is demonstrated to be the variation of magneto-volume coupling induced by Ni alloying. The alloy influence on the finite temperature evolution of Ni impact is evaluated for elements Cr, Mo and N.

  • 11.
    Dong, Zhihua
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Vitos, Levente
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Finite temperature magnetic properties of CrxCoyNi100-x-y medium entropy alloys from first principles2019Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 171, s. 78-82Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The magnetic structure of polymorphic Cr-Co-Ni medium entropy alloys is investigated as a function of temperature and chemical composition by ab initio calculations. Besides the thermal lattice expansion, the longitudinal spin fluctuations (LSFs) are accounted for in determining the magnetic state at finite temperature. We show that sizable local magnetic moments persist on all alloy components in the paramagnetic state for both face-centered cubic and hexagonal close-packed structures, and each alloy species exhibits particular temperature and concentration dependencies. The crucial role of LSFs for the finite temperature magnetic state and its impact on the temperature dependent elastic parameters are demonstrated.

  • 12. Edmondson, P. D.
    et al.
    Parish, C. M.
    Zhang, Y.
    Hallén, Anders
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Integrerade komponenter och kretsar.
    Miller, M. K.
    Helium entrapment in a nanostructured ferritic alloy2011Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 65, nr 8, s. 731-734Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A nanostructured ferritic alloy was irradiated with He+ to simulate service in a nuclear reactor and to test the hypothesis that the surface of nanoclusters is a preferential nucleation site for He bubbles. Transmission electron microscopy and atom probe tomography showed direct evidence of He bubble nucleation on the surfaces of nanoclusters and Ti(N,C) precipitates, and along grain boundaries and dislocations, thereby demonstrating an alloy design approach to improve the radiation tolerance of structural steels in the extreme environments found in nuclear reactors.

  • 13. Fashandi, H.
    et al.
    Andersson, M.
    Eriksson, J.
    Lu, J.
    Smedfors, Katarina
    KTH, Skolan för informations- och kommunikationsteknik (ICT).
    Zetterling, Carl-Mikael
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Integrerade komponenter och kretsar.
    Spetz, A. Lloyd
    Eklund, P.
    Single-step synthesis process of Ti3SiC2 ohmic contacts on 4H-SiC by sputter-deposition of Ti2015Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 99, s. 53-56Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report a single-step procedure for growth of ohmic Ti3SiC2 on 4H-SiC by sputter-deposition of Ti at 960 degrees C, based on the Ti-SiC solid-state reaction during deposition. X-ray diffraction and electron microscopy show the growth of interfacial Ti3SiC2. The as-deposited contacts are ohmic, in contrast to multistep processes with deposition followed by rapid thermal annealing. This procedure also offers the possibility of direct synthesis of oxygen-barrier capping layers before exposure to air, potentially improving contact stability in high-temperature and high-power devices.

  • 14.
    Gorbatov, Oleg I.
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap. Nosov Magnitogorsk State Technical University, Russian Federation.
    Gornostyrev, Y. N.
    Korzhavyi, Pavel A.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap. Institute of Metal Physics, Russian Federation.
    Many-body mechanism of Guinier-Preston zones stabilization in Al–Cu alloys2017Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 138, s. 130-133Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Thermodynamics and atomic structures of pre-precipitates in dilute Al–Cu alloys are studied using Metropolis Monte Carlo simulations with many-body effective cluster interactions that have been systematically derived from ab initio supercell calculations. We show that many-body interactions, including the contributions due to lattice relaxations around the solute atoms, are mainly responsible for the formation of metastable planar atomic arrangements known as Guinier-Preston zones. Interaction terms up to four-body clusters are shown to be necessary to correctly reproduce the structures and temperatures of pre-precipitation in Al–Cu solid solutions.

  • 15.
    Gorbatov, Oleg I.
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap. Institute of Quantum Materials Science, Russian Federation.
    Gornostyrev, Yu. N.
    Institute of Quantum Materials Science, Russian Federation.
    Korzhavyi, Pavel A.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap. Institute of Metal Physics, Russian Federation .
    Ruban, Andrei V.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap. Materials Center Leoben, Austria .
    Effect of Ni and Mn on the formation of Cu precipitates in α-Fe2015Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 102, s. 11-14Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Decomposition in bcc Fe-Cu-Ni and Fe-Cu-Mn alloys is studied using statistical thermodynamics simulations with ab initio effective interactions. It is demonstrated that magnetic state strongly affects the effective interactions in these systems, substantially increasing phase separation tendency with magnetization. Simulations show that Ni is promoting precipitation of Cu by segregating to the precipitate matrix interface, while Mn produces almost no effect distributing more homogeneously in the system. The obtained distributions of Ni and Mn are in good agreement with experimental data.

  • 16.
    Gouldstone, Andrew
    et al.
    Dept. of Mat. Sci. and Engineering, Massachusetts Inst. of Technology.
    Wikström, Adam
    KTH, Tidigare Institutioner (före 2005), Hållfasthetslära.
    Gudmundson, Peter
    KTH, Tidigare Institutioner (före 2005), Hållfasthetslära.
    Suresh, Subra
    Dept. of Mat. Sci. and Engineering, Massachusetts Inst. of Technology.
    Onset of plastic yielding in thin metal lines deposited on substrates1999Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 41, nr 3, s. 297-304Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A thermoelastic analysis of patterned lines on substrates to determine the critical conditions for the onset of yielding is investigated, which provides a new analytical tool for determining the yield properties of lines relative to those of films of the same thickness. Verification of the theory is provided with the aid of finite element simulations, and a method for experimentally extracting the plastic properties of lines is also outlined.

  • 17. Grönhagen, K.
    et al.
    Ågren, John
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Metallografi.
    Odén, M.
    Phase-field modelling of spinodal decomposition in TiAlN including the effect of metal vacancies2015Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 95, s. 42-45Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Using a CALPHAD approach together with a Cahn-Hilliard model, we describe the microstructure evolution in cubic Ti1-xAlxN including vacancies on the metal sublattice. Our results show that vacancy content has a pronounced effect on the decomposition kinetics. Furthermore, vacancies show a strong tendency to segregate to the coherent AlN-TiN interface regions. We illustrate how vacancies anneal to grain boundaries, and finally, we compare our prediction to experimental differential scanning calorimetry data and attribute the second peak in the thermogram to vacancy depletion.

  • 18.
    Gu, Z. J.
    et al.
    Northeastern Univ, Key Lab Anisotropy & Texture Mat, Minist Educ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China..
    Tian, Y. Z.
    Northeastern Univ, Key Lab Anisotropy & Texture Mat, Minist Educ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China..
    Xu, W.
    Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China..
    Lu, Song
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Egenskaper.
    Shang, X. L.
    GD Midea Air Conditioning Equipment Co Ltd, Innovat Ctr, Foshan 528311, Peoples R China..
    Wang, J. W.
    Zhejiang Univ, Sch Mat Sci & Engn, Ctr Electron Microscopy, Hangzhou 310027, Peoples R China.;Zhejiang Univ, Sch Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310027, Peoples R China..
    Qin, G. W.
    Northeastern Univ, Key Lab Anisotropy & Texture Mat, Minist Educ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China.;Northeastern Univ, Res Ctr Met Wires, Shenyang 110819, Peoples R China..
    Optimizing transformation-induced plasticity in CoCrNi alloys by combined grain refinement and chemical tuning2022Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 214, s. 114658-, artikkel-id 114658Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Grain refinement increases yield strength, but usually at the cost of ductility reduction. In the present work, we explored the strategy of grain refinement and composition tuning in CoCrNi alloys to optimize mechanical properties. Grain refinement was found to strongly suppress deformation-induced martensitic transformation in metastable CoCrNi alloys, which was utilized to modulate the transformation-induced plasticity (TRIP) effect in combination with composition tuning guided by theoretical calculations. We demonstrated in a non-equiatomic CoCrNi TRIP medium-entropy alloy (MEA) that our approach resulted in an excellent combination of strength and ductility. The proposed strategy is expected to be useful in exploring superior mechanical properties of MEAs and high-entropy alloys in varying systems.

  • 19. Hillert, M.
    et al.
    Odqvist, J.
    Ågren, John
    KTH, Tidigare Institutioner (före 2005), Metallurgi.
    Comparison between solute drag and dissipation of Gibbs energy by diffusion2001Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 45, nr 2, s. 221-227Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The solute drag and the dissipation of Gibbs energy in a partitionless phase transformation are compared numerically. They agree if the solute drag is compared with the driving force over the interface and the solute spike in front of the interface. The dissipation can be evaluated over this whole region or over the interface alone.

  • 20.
    Hillert, Mats
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Metallografi.
    Comments on "Eutectic solidification of gray cast iron"2005Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 52, nr 3, s. 249-250Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Applying a new technique for studying the orientation of austenite at room temperature, where it would normally transform to martensite, Rivera et al. have studied the solidification of gray cast iron. Their conclusions are in general agreement with the classical work in this field.

  • 21.
    Hillert, Mats
    KTH, Tidigare Institutioner (före 2005), Materialvetenskap.
    Nature of local equilibrium at the interface in the growth of ferrite from alloyed austenite2002Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 46, nr 6, s. 447-453Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The increase over the years of experimental information on the effect of alloying elements on the transformation of austenite to ferrite and of the theoretical understanding is reviewed. The prediction of two kinds of transitions in behavior is described and the importance of exploring them experimentally is stressed.

  • 22.
    Hillert, Mats
    KTH, Tidigare Institutioner (före 2005), Materialvetenskap.
    Paradigm shift for bainite2002Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 47, nr 3, s. 175-180Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    One of the pictures of the mechanism of the bainitic transformation has been based upon the paradigm that it is closely related to the martensitic transformation. It has resulted in an unjustified belief in high growth velocity and high supersaturation of carbon in bainitic ferrite. It seems that the time is now right for abandoning that paradigm.

  • 23.
    Hillert, Mats
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Borgenstam, Annika
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Metallografi.
    Ågren, John
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Metallografi.
    Do bainitic and Widmanstatten ferrite grow with different mechanisms?2010Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 62, nr 2, s. 75-77Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Caballero et al. recently presented new evidence for different growth mechanisms of Widmanstatten and bainitic ferrite. Their argument was based on Zener's hypothesis of diffusionless growth of bainitic ferrite. It is now demonstrated that Bhadeshia's model, based on Zener's hypothesis, predicts that some of the new measurements, claimed to fall above B-s and to be due to Widmanstatten ferrite, actually fall within the predicted temperature range of bainite, indicating that they cannot be used as new support for Bhadeshia's model.

  • 24.
    Hillert, Mats
    et al.
    KTH, Tidigare Institutioner (före 2005), Materialvetenskap.
    Höglund, Lars
    KTH, Tidigare Institutioner (före 2005), Materialvetenskap.
    Comments on kinetics model of isothermal pearlite formation in a 0.4C-1.6Mn steel2004Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 50, nr 1, s. 171-173Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A recent attempt to use the volume fraction of isothermally formed pearlite to decide how Mn partitions between ferrite and cementite is criticized. An alternative method is proposed.

  • 25.
    Hillert, Mats
    et al.
    KTH, Tidigare Institutioner (före 2005), Materialvetenskap.
    Höglund, Lars
    KTH, Tidigare Institutioner (före 2005), Materialvetenskap.
    Comments on Reply to comments on kinetics model of isothermal pearlite formation in a 0.4C-1.6Mn steel2004Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 51, nr 1, s. 77-78Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A recent statement that the correction of a serious error in a thermodynamic calculation was not relevant to the interpretation is shown to be caused by the use of an incorrect equation instead of the lever rule.

  • 26.
    Hillert, Mats
    et al.
    KTH, Tidigare Institutioner (före 2005), Materialvetenskap.
    Höglund, Lars
    KTH, Tidigare Institutioner (före 2005), Materialvetenskap.
    Melting of a peritectic phase2004Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 50, nr 7, s. 1055-1059Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The reverse of a peritectic reaction belongs to the class of eutectic and eutectoid reactions and the same theory is now applied after modification for the fact that the predominating diffusion occurs within one of the growing phases, here the liquid one. The complications caused by the metastable congruent melting point are examined.

  • 27.
    Hillert, Mats
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Höglund, Lars
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Mobility of alpha/gamma phase interfaces in Fe alloys2006Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 54, nr 7, s. 1259-1263Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Information on the mobility of alpha/gamma phase interfaces in Fe alloys has been scarce and one has long relied on an evaluation for alpha/alpha grain boundaries. New and old information is now reviewed. There are strong indications that the mobility is much lower than for alpha/alpha grain boundaries.

  • 28.
    Hillert, Mats
    et al.
    KTH, Tidigare Institutioner (före 2005), Materialvetenskap.
    Odqvist, Joakim
    KTH, Tidigare Institutioner (före 2005), Materialvetenskap.
    Ågren, John
    KTH, Tidigare Institutioner (före 2005), Materialvetenskap.
    Interface conditions during diffusion-controlled phase transformations2004Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 50, nr 4, s. 547-550Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Considerations of the driving force on the interface in diffusional phase transformations are usually limited to diffusion in the parent phase. Diffusion in both phases is now considered. Equations are derived for the calculation of the composition of the material crossing the interface and the driving force acting on the interface.

  • 29.
    Hillert, Mats
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Selleby, Malin
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Discussion of cementite layer formation and sooting2010Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 63, nr 11, s. 1037-1040Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A thermodynamic explanation was recently proposed for the formation of massive layers of cementite without any graphite by gas carburization of steels at 550 degrees C if the gas contains NH(3). That explanation is now criticized. It is proposed that a kinetic factor, based on the difficulty of precipitating graphite inside a solid matrix, may contribute to the inhibition of metal dusting in the presence of NH3.

  • 30.
    Hillert, Mats
    et al.
    KTH, Tidigare Institutioner (före 2005), Materialvetenskap.
    Ågren, John
    KTH, Tidigare Institutioner (före 2005), Metallurgi.
    Discussion on local equilibrium at solid/liquid interfaces during melting2002Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 46, nr 6, s. 455-457Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Melting experiments were recently used to support the assumption of considerable deviation from local equilibrium. It is now claimed that the observed velocities of melting were low enough to allow diffusion in the solid to give a well developed spike of the solute in front of the migrating interface making a strong deviation from local equilibrium unlikely.

  • 31.
    Hillert, Mats
    et al.
    KTH, Tidigare Institutioner (före 2005), Metallurgi.
    Ågren, John
    KTH, Tidigare Institutioner (före 2005), Metallurgi.
    On the definitions of paraequilibrium and orthoequilibrium2004Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 50, nr 5, s. 697-699Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Hultgren's terminology of paraferrite and paracementite in alloy steels and his definition of paraequilibrium are reviewed. They are not completely compatible due to the possibility of forming ferrite with the initial alloy content (paraferrite) even under full local equilibrium (local orthoequilibrium). That has caused some confusion.

  • 32.
    Hillert, Mats
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Ågren, John
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Reply to comments on "On the definition of paraequilibrium and orthoequilibrium"2005Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 52, nr 1, s. 87-88Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In the equilibrium conditions called CPE the letters PE stand for paraequilibrium. However, paraequilibrium plays no important role in the process for which CPE was introduced. The essential feature is the equilibration of carbon between a and γ under the constraint that the interface is immobile. In order to avoid confusion regarding the nature of paraequilibrium, the term CCE (constrained carbon equilibrium) is proposed instead of CPE.

  • 33.
    Hoseini-Athar, Mohammad Mehdi
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap. Univ Tehran, Coll Engn, Sch Met & Mat Engn, Tehran, Iran..
    Mahmudi, R.
    Univ Tehran, Coll Engn, Sch Met & Mat Engn, Tehran, Iran..
    Babu, Prasath
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Hedström, Peter
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Tailoring the texture of an extruded Mg sheet through constrained groove pressing for achieving low mechanical anisotropy and high yield strength2020Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 186, s. 253-258Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Constrained groove pressing (CGP) was utilized to modify the texture and mechanical properties of extruded Mg-2Gd-3Zn sheet with typical TD (transverse direction)-split texture and pronounced mechanical anisotropy. The texture evolution sequence during CGP was studied and it was observed that a new (1211) component with basal poles rotated 15-30 toward the extrusion direction (ED) is introduced during CGP, as a result of simultaneous activation of basal and prismatic slip and shear deformation. Finally, a non-basal ED-TD double split texture was obtained after the CGP process, resulting in significantly reduced mechanical anisotropy.

  • 34.
    Hoseini-Athar, Mohammad Mehdi
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap. Univ Tehran, Sch Met & Mat Engn, Coll Engn, Tehran, Iran..
    Mahmudi, R.
    Univ Tehran, Sch Met & Mat Engn, Coll Engn, Tehran, Iran..
    Babu, Prasath
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Hedström, Peter
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Tailoring the texture of an extruded Mg sheet through constrained groove pressing for achieving low mechanical anisotropy and high yield strength (vol 186, pg 253, 2020)2020Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 188, s. 92-95Artikkel i tidsskrift (Fagfellevurdert)
  • 35. Hou, T. P.
    et al.
    Peet, Mathew James
    Hulme-Smith, Christopher
    University Of Cambridge.
    Wu, K. M.
    Li, Y.
    Guo, L.
    The determining role of magnetic field in iron and alloy carbide precipitation behaviors under the external field2016Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 120, s. 76-79Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A combined approach to calculate the thermodynamic properties of iron and alloy carbides including the thermal and magnetic contribution is derived. Special emphasis is placed on the role of Fe and Mo to the Gibbs free energy. Lower Mo concentration in the carbides corresponds to a higher thermal Gibbs free energy change. The higher Fe content and external magnetic field greatly increase the induced magnetization, reducing the magnetic Gibbs free energy substantially and therefore increase the formation temperature. The stability of M 2 C and M 3 C are mainly determined by the thermal factors, whereas magnetic field has a predominant contribution for M 6 C.

  • 36.
    Hou, Ziyong
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Linder, David
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Hedström, Peter
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Ström, Valter
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Holmström, E.
    Sandvik Coromant R&D, SE 126 80 Stockholm, Sweden.
    Borgenstam, Annika
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Evaluating magnetic properties of composites from model alloys – Application to alternative binder cemented carbides2019Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 168, s. 96-99Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The magnetic properties of 85Ni-15Fe model alloys containing Co, W and C have been studied with the intent to isolate the influence of alloy chemistry on quality control measurements of alternative binder cemented carbides. The results show a strong influence of dissolved W on the Curie temperature and the saturation magnetization. The amount of dissolved C, and the presence of WC precipitates, on the other hand, is shown to have negligible effect. Furthermore, the magnetic coercivity is indicated to be entirely dominated by the microstructural features and quite insensitive to composition.

  • 37.
    Huang, Shuo
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad materialfysik.
    Li, Wei
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad materialfysik.
    Lu, Song
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad materialfysik.
    Tian, Fuyang
    Univ Sci & Technol Beijing, Dept Phys, Beijing 100083, Peoples R China..
    Shen, Jiang
    Univ Sci & Technol Beijing, Dept Phys, Beijing 100083, Peoples R China..
    Holmstrom, Erik
    Sandvik Coromant R&D, S-12680 Stockholm, Sweden..
    Vitos, Levente
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad materialfysik. Uppsala Univ, Div Mat Theory, Dept Phys & Astron, SE-75120 Uppsala, Sweden.
    Temperature dependent stacking fault energy of FeCrCoNiMn high entropy alloy2015Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 108, s. 44-47Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The stacking fault energy (SFE) of paramagnetic FeCrCoNiMn high entropy alloy is investigated as a function of temperature via ab initio calculations. We divide the SFE into three major contributions: chemical, magnetic and strain parts. Structural energies, local magnetic moments and elastic moduli are used to estimate the effect of temperature on each term. The present results explain the recently reported twinning observed below room-temperature and predict the occurrence of the hexagonal phase at cryogenic conditions.

  • 38.
    Hulme-Smith, Christopher
    et al.
    Materials Science and Metallurgy, University of Cambridge, UK.
    Lonardelli, I.
    Materials Engineering and Industrial Technologies, University of Trento, Italy.
    Dippel, A. C.
    Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany.
    Bhadeshia, Harshad Kumar Dharamshi Hansraj
    Materials Science and Metallurgy, University of Cambridge, UK.
    Experimental evidence for non-cubic bainitic ferrite2013Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 69, nr 5, s. 409-412Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The first evidence is provided for the existence of a tetragonal or slightly orthorhombic unit cell of bainitic ferrite. It supports the hypothesis that the excess carbon that persists in the ferrite, which is in contact with austenite, is a consequence of an increased solubility due to the change in symmetry from the conventional cubic unit cell. The deviations from the cubic cell are maintained to elevated temperatures, as expected from an increased solubility of carbon in the ferrite.

  • 39.
    Hulme-Smith, Christopher
    et al.
    Materials Science and Metallurgy, University of Cambridge, UK.
    Lonardelli, I.
    Materials Engineering and Industrial Technologies, University of Trento, Italy.
    Peet, Mathew James
    Materials Science and Metallurgy, University of Cambridge, UK.
    Dippel, A. C.
    Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany.
    Bhadeshia, Harshad Kumar Dharamshi Hansraj
    Materials Science and Metallurgy, University of Cambridge, UK.
    Enhanced thermal stability in nanostructured bainitic steel2013Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 69, nr 2, s. 191-194Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report an attempt at increasing the thermal stability of nanocrystalline bainite to tempering heat treatments by enhancing the silicon concentration of the alloy. Validation experiments have been conducted using synchrotron X-irradiation during tempering heat treatment. It is found that the change in alloying successfully stabilizes the austenite at elevated temperatures by retarding cementite formation to temperatures as high as 500 ˚C. Other changes reflected in the lattice parameters of the major phases have revealed further information about the mechanisms involved.

  • 40. Kaufman, Larry
    et al.
    Ågren, John
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Metallografi.
    CALPHAD, first and second generation - Birth of the materials genome2014Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 70, nr 1, s. 3-6Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The "materials genome" was given a rather vague definition in US President Obama's announcement in 2011. We argue that the materials genome, analogously with biological genomes, should be defined as a set of information (databases) allowing prediction of a material's structure, as well as its response to processing and usage conditions. The materials genome is thus encoded in the language of CALPHAD thermodynamics and kinetics, as such databases are major parts of integrated computational materials engineering.

  • 41.
    Kese, Kwadwo
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Li, Zhi-Cheng
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Semi-ellipse method for accounting for the pile-up contact area during nanoindentation with the Berkovich indenter2006Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 55, nr 8, s. 699-702Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A method of approximating the pile-up contact perimeter as a semi-ellipse originally developed for soda-lime glass, has been investigated for its applicability to other materials including work-hardened copper, Zr-based bulk metallic glass, strontium fluoroapatite, tungsten carbide, silicon nitride and aluminium oxide. The study revealed that all the materials formed pile-ups during nanoindentation. The elastic modulus and hardness values obtained after correcting for the pile-up contact area using the semiellipse approximation were,consistent with those found in the literature.

  • 42. Kim, D. K.
    et al.
    Zhang, Y.
    Voit, W.
    Kao, K. V.
    Kehr, J.
    Bjelke, B.
    Muhammed, Mamoun
    KTH, Tidigare Institutioner (före 2005), Materialvetenskap.
    Superparamagnetic iron oxide nanoparticles for bio-medical applications2001Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 44, nr 09-aug, s. 1713-1717Artikkel i tidsskrift (Fagfellevurdert)
  • 43. Kodash, V. Y.
    et al.
    Groza, J. R.
    Aldica, G.
    Toprak, Muhammet
    Li, Shanghua
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
    Muhammed, Mamoun
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Field-activated sintering of skutterudites2007Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 57, nr 6, s. 509-511Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Skutterudite (Co0.92Ni0.08)4Sb11.88Te0.12 powder has been consolidated under an applied electrical field using a field-assisted sintering technique (FAST). The low FAST sintering temperature and relatively high heating rate considerably reduce grain growth during sintering.

  • 44.
    Larsson, Henrik
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Metallografi.
    Borgenstam, Annika
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Metallografi.
    Trans-interface diffusivity in the Fe-Ni system2007Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 56, nr 1, s. 61-64Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The trans-interface diffusivity in the Fe-Ni system has been estimated by fitting simulations to experimental data. For diffusion across the alpha/gamma phase boundary, the mobility of species divided by an interfacial thickness of 1 nm, M-k/delta, is approximately 5% of the phase interface mobility M-int at 873 K and 15% at 973 K.

  • 45.
    Larsson, Henrik
    et al.
    KTH, Tidigare Institutioner (före 2005), Materialvetenskap.
    Ågren, John
    KTH, Tidigare Institutioner (före 2005), Materialvetenskap.
    A random-walk approach to diffusion controlled growth2003Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 49, nr 6, s. 521-526Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The new method does not require formulation of any special conditions at the moving phase interface. Although only binary systems are treated at present an extension to any number of components seems straightforward. A good agreement with conventional front tracking techniques (DICTRA) is found.

  • 46.
    Larsson, Henrik
    et al.
    KTH, Tidigare Institutioner (före 2005), Materialvetenskap.
    Ågren, John
    KTH, Tidigare Institutioner (före 2005), Materialvetenskap.
    A random-walk approach to diffusion controlled growth II: A distribution function solution2004Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 51, nr 2, s. 137-140Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Earlier work on simulations of diffusion controlled transformations based on a random-walk technique is extended; a random-walk simulation of a transformation in a ternary system and a new method based on distribution functions are presented. As before, no special assumption regarding the state of the phase interface is required.

  • 47.
    Li, Changle
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Egenskaper.
    Lu, Song
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Egenskaper.
    Vitos, Levente
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Egenskaper. Uppsala Univ, Dept Phys & Astron, Div Mat Theory, Box 516, SE-75120 Uppsala, Sweden.;Wigner Res Ctr Phys, Res Inst Solid State Phys & Opt, POB 49, H-1525 Budapest, Hungary..
    Predicting grain boundary energies of complex alloys from ab initio calculations2021Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 203, artikkel-id 114118Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Investigating the grain boundary energies of pure fcc metals and their surface energies obtained from ab initio modeling, we introduce a robust method to estimate the grain boundary energies for complex multicomponent alloys. The input parameter is the surface energy of the alloy, which can easily be accessed by modern ab initio calculations based on density functional theory. The method is demonstrated in the case of paramagnetic Fe-Cr-Ni alloys for which experimental grain boundary data is available.

  • 48. Louzguine-Luzgin, D.V.
    et al.
    Jiang, J.
    Bazlov, A.I.
    Zolotorevzky, V.S.
    Mao, H.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap. Thermo-Calc Software AB, Råsundavägen 18, 16967 Solna, Sweden.
    Ivanov, Yu.P.
    Greer, A.L.
    Phase separation process preventing embrittlement of a Zr-Cu-Fe-Al bulk metallic glass.2019Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 167, s. 31-36Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The structural changes and mechanical properties of a Zr 63 Cu 22 Fe 5 Al 10 bulk metallic glass (BMG), and a Zr 63 Cu 27 Al 10 one made for comparison, were studied on annealing below the crystallization temperature. The phase composition of the samples was studied by conventional X-ray diffractometry and high-resolution transmission electron microscopy including the atomic-scale elemental mapping. The samples were mechanically tested in compression. The Zr 63 Cu 22 Fe 5 Al 10 bulk metallic glass shows a high strength and good deformability at room temperature both in the as-cast state and after prolonged structural relaxation below the crystallization temperature. The reasons for such behavior are discussed in the present work.

  • 49. Morral, J. E.
    et al.
    Pan, X. M.
    Zhou, N.
    Larsson, Henrik
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Metallografi.
    Wang, Y. Z.
    Singularities in multiphase diffusion couples2008Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 58, nr 11, s. 970-972Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Singularities are not normally expected in diffusion couple data; however, they can occur in certain multiphase concentration profiles and diffusion paths. The following work reviews the theoretical reason why singularities form and gives two different computer simulations that support the theoretical predictions. In addition, a correction is given to a previous paper in which artifacts created by modeling software were inadvertently reported as diffusional singularities.

  • 50.
    Odqvist, Joakim
    Thermo-Calc Software AB.
    On the transition to massive growth during the γ->α transformation in Fe-Ni alloys2005Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 52, nr 3, s. 193-197Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A newly developed procedure for calculating deviation from local equilibrium at phase interfaces, caused by dissipation of Gibbs energy due to diffusion inside the interface, was implemented in the DICTRA code. The austenite to ferrite transformation in Fe-Ni alloys and the transition to a massive transformation upon cooling is studied.

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