kth.sePublications
Change search
Refine search result
1 - 21 of 21
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Cao, Yanhui
    et al.
    Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China.;Luoyang Ship Mat Res Inst, State Key Lab Marine Corros & Protect, Xiamen 361101, Peoples R China..
    Zheng, Dajiang
    Xiamen Univ, Coll Mat, Xiamen 361005, Peoples R China..
    Zhang, Fan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.
    Pan, Jinshan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.
    Lin, Changjian
    Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China..
    Layered double hydroxide (LDH) for multi-functionalized corrosion protection of metals: A review2022In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 102, p. 232-263Article, review/survey (Refereed)
    Abstract [en]

    Layered double hydroxide (LDH) has been widely developed in the field of corrosion and protection in recent years based on its unique characteristics including anion capacity, anion exchange ability, structure memory effect, and barrier resistance. This paper comprehensively reviews recent work on the preparations, properties of LDH in the forms of powder and film and their applications in different environments in corrosion and protection. Some novel perspectives are also proposed at the end of the review for future research in corrosion and protection field.

  • 2.
    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..
    Xie, P.
    Hunan Univ, Coll Mat Sci & Engn, Ctr High Resolut Electron Microscopy, Changsha 410082, Peoples R China..
    Han, L. L.
    Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China..
    He, J. Y.
    Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China..
    Li, Xiaoqing
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Properties.
    Zhang, J.
    Hunan Univ, Coll Mat Sci & Engn, Ctr High Resolut Electron Microscopy, Changsha 410082, Peoples R China..
    Li, Z. T.
    Hunan Univ, Coll Mat Sci & Engn, Ctr High Resolut Electron Microscopy, Changsha 410082, Peoples R China..
    Li, Y. P.
    Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China..
    Liu, B.
    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..
    Chen, J. H.
    Hunan Univ, Coll Mat Sci & Engn, Ctr High Resolut Electron Microscopy, Changsha 410082, Peoples R China..
    Unveiling anneal hardening in dilute Al-doped AlxCoCrFeMnNi (x=0, 0.1) high-entropy alloys2021In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 91, p. 270-277Article in journal (Refereed)
    Abstract [en]

    Anneal hardening has been one of the approaches to improve mechanical properties of solid solution alloys with the face-centered cubic (FCC) structure, whereby a considerable strengthening can be attained by annealing of cold-worked alloys below the recrystallization temperature (T-rx). Microscopically, this hardening effect has been ascribed to several mechanisms, i.e. solute segregation to defects (dislocation and stacking fault) and short-range chemical ordering, etc. However, none of these mechanisms can well explain the anneal hardening recently observed in phase-pure and coarse-grained FCC-structured high-entropy alloys (HEAs). Here we report the observations, using high-resolution electron channeling contrast imaging and transmission electron microscopy, of profuse and stable dislocation substructures in a cold-rolled CoCrFeMnNi HEA subject to an annealing below T-rx. The dislocation substructures are observed to be thermally stable up to T-rx, which could arise from the chemical complexity of the high-entropy system where certain elemental diffusion retardation occurs. The microstructure feature is markedly different from that of conventional dilute solid solution alloys, in which dislocation substructures gradually vanish by recovery during annealing, leading to a strength drop. Furthermore, dilute addition of 2 at.% Al leads to a reduction in both microhardness and yield strength of the cold-rolled and subsequently annealed (<= 500 degrees C) HEA. This Al induced softening effect, could be associated with the anisotropic formation of dislocation substructure, resulting from enhanced dislocation planar slip due to glide plane softening effect. These findings suggest that the strength of HEAs can be tailored through the anneal hardening effect from dislocation substructure strengthening.

  • 3.
    Cheng, Qing
    et al.
    Hunan Univ, Coll Mat Sci & Engn, Ctr High Resolut Electron Microscopy, Changsha 410082, Peoples R China..
    Mo, Jinyong
    China Univ Min & Technol, Inst Mass Amorphous Met Sci, Sch Mat Sci & Phys, Xuzhou 221116, Peoples R China..
    Li, Xiaoqing
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Properties.
    Xu, Xiandong
    Hunan Univ, Coll Mat Sci & Engn, Ctr High Resolut Electron Microscopy, Changsha 410082, Peoples R China..
    A revisit to the role of Mo in an MP35N superalloy: An experimental and theoretical study2023In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 157, p. 60-70Article in journal (Refereed)
    Abstract [en]

    Molybdenum (Mo) has been recognized as an essential alloying element of the MP35N (Co35.4Cr22.9Ni35.5Mo6.2, at.%) superalloy for enhancing strength and corrosion resistance. However, a full understanding of the addition of Mo on microstructure and mechanical properties of the Mo-free parent alloy is lacking. In this work, we consider five (Co37.7Cr24.4Ni37.9)100-xMox (x = 0, 0.7, 2.0, 3.2, and 6.2) alloys, and reveal that yield/tensile strength and ductility are continuously increased for these alloys with increasing Mo content while a single-phase face-centered cubic structure remains unchanged. It is found that strong solid solution strengthening (SSS) is a main domain to the improved yield strength, whereas grain boundaries are found to soften by the Mo addition. The first-principles calculations demonstrate that a severe local lattice distortion contributes to the enhanced SSS, and the grain boundary softening effect is mostly associated with the decreased shear modulus. Both first-principles calculations and scanning transmission electron microscopy observations reveal that the stacking fault energy (SFE) reduces by the Mo addition. The calculated SFE value decreases from 0.4 mJ/m2 to-11.8 mJ/m2 at 0 K as Mo content increases from 0 at.% to 6.2 at.%, and experimentally measured values of SFE at room temperature for both samples are about 18 mJ/m2 and 9 mJ/m2, respectively. The reduction of SFE promoted the generation of stacking faults and deformation twins, which sustain a high strain hardening rate, thus postponing necking instability and enhancing tensile strength and elongation.

  • 4.
    Dong, Zhihua
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. College of Materials Science and Engineering, Chongqing University, Chongqing 400030, China.
    Huang, Shuo
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Department of Physics and Astronomy, Division of Materials Theory, Uppsala University, Uppsala SE-75121, Sweden.
    Ström, Valter
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Chai, Guocai
    Division of Engineering Materials, Department of Management and Engineering, Linköping University, Linköping SE-58183, Sweden f AB Sandvik Materials Technology R&D Center, Sandviken SE-81181, Sweden Author links open overlay panel.
    Varga, Lajos Karoly
    Research Institute for Solid State Physics and Optics, Wigner Research Center for Physics, P.O. Box 49, H-1525 Budapest, Hungary.
    Eriksson, Olle
    Department of Physics and Astronomy, Division of Materials Theory, Uppsala University, Uppsala SE-75121, Sweden g School of Science and Technology, Örebro University, Örebro SE-70281, Sweden.
    Vitos, Levente
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. KTH, School of Engineering Sciences (SCI), Applied Physics. Department of Physics and Astronomy, Division of Materials Theory, Uppsala University, Uppsala SE-75121, Sweden h Research Institute for Solid State Physics and Optics, Wigner Research Center for Physics, P.O. Box 49, H-1525 Budapest, Hungary.
    MnxCr0.3Fe0.5Co0.2Ni0.5Al0.3 high entropy alloys for magnetocaloric refrigeration near room temperature2021In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 79, p. 15-20Article in journal (Refereed)
    Abstract [en]

    High entropy alloys (HEAs) based on transition metals display rich magnetic characteristics, however attempts on their application in energy efficient technologies remain scarce. Here, we explore the magnetocaloric application for a series of MnxCr0.3Fe0.5Co0.2Ni0.5Al0.3 (0.8 &lt; x &lt; 1.1) HEAs by integrated theoretical and experimental methods. Both theory and experiment indicate the designed HEAs have the Curie temperature close to room temperature and is tunable with Mn concentration. A non-monotonic evolution is observed for both the entropy change and the relative cooling power with changing Mn concentration. The underlying atomic mechanism is found to primarily emerge from the complex impact of Mn on magnetism. Advanced magnetocaloric properties can be achieved by tuning Mn concentration in combination with controlling structural phase stability for the designed HEAs. 

  • 5.
    Gui, Lintao
    et al.
    Chongqing Univ, Coll Mat Sci & Engn, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China.;Chongqing Univ, Chongqing Key Lab Vanadium Titanium Met & New Mat, Chongqing 400044, Peoples R China..
    Long, Mujun
    Chongqing Univ, Coll Mat Sci & Engn, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China.;Chongqing Univ, Chongqing Key Lab Vanadium Titanium Met & New Mat, Chongqing 400044, Peoples R China..
    Wu, Shixin
    Chongqing Univ, Coll Mat Sci & Engn, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China.;Chongqing Univ, Chongqing Key Lab Vanadium Titanium Met & New Mat, Chongqing 400044, Peoples R China..
    Dong, Zhihua
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Chen, Dengfu
    Chongqing Univ, Coll Mat Sci & Engn, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China.;Chongqing Univ, Chongqing Key Lab Vanadium Titanium Met & New Mat, Chongqing 400044, Peoples R China..
    Huang, Yunwei
    Chongqing Univ, Coll Mat Sci & Engn, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China.;Chongqing Univ, Chongqing Key Lab Vanadium Titanium Met & New Mat, Chongqing 400044, Peoples R China..
    Duan, Huamei
    Chongqing Univ, Coll Mat Sci & Engn, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China.;Chongqing Univ, Chongqing Key Lab Vanadium Titanium Met & New Mat, Chongqing 400044, Peoples R China..
    Vitos, Levente
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Quantitative effects of phase transition on solute partition coefficient, inclusion precipitation, and microsegregation for high-sulfur steel solidification2019In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 35, no 10, p. 2383-2395Article in journal (Refereed)
    Abstract [en]

    Segregation and inclusion precipitation are the common behaviours of steel solidification, which are resulted from the redistribution and diffusion of the solute elements at the solid-liquid interface. The effect of the phase transition of high-sulfur free-cutting steel is quantified in the present work for the solute partition coefficient (k(i)), inclusion precipitation, and microsegregation by establishing a coupling model of microsegregation and inclusion precipitation, wherein the quantified dependencies of k(i) in terms of temperature, phase and carbon temperature range and phase transition of high-sulfur steel that under different solidification paths and C contents were quite different, leading to differences in k(i) and eventually in microsegregation. k k(p), and k(s) were mainly affected by phase composition and k(si) was primarily by temperature, while k(mn) depended on both phase composition and temperature during solidification. Increasing the C content within the interval 0.07-0.48 wt%, the 'proportion of the delta phase maintained temperature region during solidification' (P-delta), k(p)(ave) and k(s)(ave) (k(i)(ave) the average value of the k(i) across the whole stages of solidification) decreased monotonically, whereas k phase composition and k(i), leading to the change in microsegregation. Such effect of the peritectic reaction was more significant at the last stage of solidification. When the P-delta was between 75% and 100% (corresponding to 0.07-0.16 wt% C), the solidification path resulted in a greater effect on the microsegregation of solutes C, P, and S because of the peritectic reaction. The microsegregation of solutes Mn and S were comprehensively influenced by k(Mn), k(s) and MnS precipitation as well. The studies would help reveal the solute redistribution at the solid-liquid interface, and improve the segregation of high-sulfur steel by controlling the solidification and precipitation in practice.

  • 6. Ni, Y.
    et al.
    Zhang, F.
    Njoku, D. I.
    Yu, Y.
    Pan, Jinshan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.
    Meng, M.
    Li, Y.
    Corrosion mechanism of CuAl-NiC abradable seal coating system—The influence of porosity, multiphase, and multilayer structure on the corrosion failure2021In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 88, p. 258-269Article in journal (Refereed)
    Abstract [en]

    In this study, the corrosion behavior of the CuAl-NiC abradable seal coating system in chloride solution was investigated to systematically research the effect of porosity, multiphase, and multilayer structure on the corrosion failure. Through the composition and structure analysis, the corrosion process of the system was predicted and then verified with mercury intrusion porosimetry, cross-section SEM/EDS analysis, and electrochemical measurements. The results demonstrated that the interphase selective corrosion caused the porosity of the top layer to decrease first and then increase during the corrosion development. The interlayer galvanic corrosion, determined by the pore connectivity, is crucial for corrosion failure.

  • 7. Scholz, S. M.
    et al.
    Dutta, Joydeep
    Hofmann, H.
    Hofmeister, H.
    Raman spectroscopic study of silicon nanopowders1997In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 13, no 4, p. 327-332Article in journal (Refereed)
    Abstract [en]

    Vibrational properties of silicon nanopowders are discussed with reference to Raman spectroscopic measurements. The powders were produced in a low pressure rf plasma from the cluster induced agglomeration of positive ions formed during the dissociation of silane. Influence of thermal treatment and the crystallization phenomena of the powder were studied. Raman spectroscopic measurements reveal size quantization effects for the particles as well as the existence of partially ordered regions in the apparently amorphous primary particles. The crystalline and amorphous volume fraction in the material were calculated from the relative spectral intensities. The results obtained in these experiments are consistent with the observations from recent high resolution transmission electron microscopy studies of these powders.

  • 8.
    Shuang, S.
    et al.
    City Univ Hong Kong, Coll Engn, Dept Mech Engn, Kowloon Tong,Kowloon, Hong Kong, Peoples R China..
    Lyu, G. J.
    Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.;Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China..
    Chung, D.
    City Univ Hong Kong, Coll Engn, Dept Mech Engn, Kowloon Tong,Kowloon, Hong Kong, Peoples R China..
    Wang, X. Z.
    Northwestern Polytech Univ, State Key Lab Solidificat Proc, Ctr Adv Lubricat & Seal Mat, Xian 710072, Peoples R China..
    Gao, X.
    City Univ Hong Kong, Coll Engn, Dept Mech Engn, Kowloon Tong,Kowloon, Hong Kong, Peoples R China..
    Mao, Huahai
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Thermo-Calc Software, Råsundav. 18, Solna, SE-16767, Sweden.
    Li, W. P.
    City Univ Hong Kong, Coll Engn, Dept Mat Sci & Engn, Kowloon Tong,Kowloon, Hong Kong, Peoples R China..
    He, Q. F.
    City Univ Hong Kong, Coll Engn, Dept Mech Engn, Kowloon Tong,Kowloon, Hong Kong, Peoples R China..
    Guo, B. S.
    Jinan Univ, Inst Adv Wear & Corros Resistant & Funct Mat, Guangzhou 510632, Peoples R China..
    Zhong, X. Y.
    City Univ Hong Kong, Coll Engn, Dept Mat Sci & Engn, Kowloon Tong,Kowloon, Hong Kong, Peoples R China..
    Wang, Y. J.
    Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.;Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China..
    Yang, Y.
    City Univ Hong Kong, Coll Engn, Dept Mech Engn, Kowloon Tong,Kowloon, Hong Kong, Peoples R China.;City Univ Hong Kong, Coll Engn, Dept Mat Sci & Engn, Kowloon Tong,Kowloon, Hong Kong, Peoples R China.;City Univ Hong Kong, Coll Engn, Dept Adv Design & Syst Engn, Kowloon Tong,Kowloon, Hong Kong, Peoples R China..
    Unusually high corrosion resistance in MoxCrNiCo medium entropy alloy enhanced by acidity in aqueous solution2023In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 139, p. 59-68Article in journal (Refereed)
    Abstract [en]

    High corrosion resistance of alloys is essential for their structural applications; however, most alloys suffer from degradation of their corrosion resistance with the increasing acidity of their surround-ings. Nonetheless, we developed a series of medium-entropy alloys (MEAs) in this work, which ex-hibit high strength, superior fracture toughness and ultra-high corrosion resistance, outperforming the variety of corrosion resistant alloys hitherto reported. Most interestingly, our MEAs exhibit an unusual anti-corrosion behavior and their corrosion resistance increases with acidity in Cl- containing solutions. Through extensive thermodynamic calculations, density functional theory (DFT) simulations and experi-ments, we reveal that the unusual anti-corrosion behavior of our MEAs can be attributed to their surface chemical complexity, which facilitates the physio-chemical-absorption of H2O and O 2 and thus the rapid formation of metastable medium entropy passive films that contain the lowest amount of defects, as compared to the passive films on conventional alloys reported in the literature.

  • 9.
    Stormvinter, Albin
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.
    Hedström, Peter
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.
    Borgenstam, Annika
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.
    A Transmission Electron Microscopy Study of Plate Martensite Formation in High-carbon Low Alloy Steels2013In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 29, no 4, p. 373-379Article in journal (Refereed)
    Abstract [en]

    The martensitic microstructures in two high-carbon low alloy steels have been investigated by classical and automated crystallographic analysis under a transmission electron microscope. It is found that the martensitic substructure changes from consisting mostly of transformation twins for 1.20 mass% carbon (C) steel to both transformation twins and planar defects on {101}(M) for 1.67 mass% C steel. In the 1.67 mass% C steel it is further found that small martensite units have a rather homogeneous substructure, while large martensite units are more inhomogeneous. In addition, the martensite units in both steels are frequently found to be of zigzag patterns and have distinct crystallographic relationships with neighboring martensite units, e.g. kink or wedge couplings. Based on the present findings the development of martensite in high-carbon low alloy steels is discussed and a schematic of the martensite formation is presented. Moreover, whether the schematic view can be applied to plate martensite formation in general, is discussed.

  • 10.
    Tan, Qiyang
    et al.
    School of Mechanical and Mining Engineering, The University of Queensland, QLD 4072, Australia.
    Chang, Haiwei
    School of Mechanical and Mining Engineering, The University of Queensland, QLD 4072, Australia.
    Lindwall, Greta
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Structures.
    Li, Erlei
    School of Chemical Engineering, The University of Queensland, QLD 4072, Australia.
    Ananthanarayanan, Durga
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. School of Mechanical and Mining Engineering, The University of Queensland, QLD 4072, Australia.
    Liang, Guofang
    School of Mechanical and Mining Engineering, The University of Queensland, QLD 4072, Australia.
    Yin, Yu
    School of Mechanical and Mining Engineering, The University of Queensland, QLD 4072, Australia.
    Wang, Geoff
    School of Chemical Engineering, The University of Queensland, QLD 4072, Australia.
    Zhang, Ming Xing
    School of Mechanical and Mining Engineering, The University of Queensland, QLD 4072, Australia.
    Unravelling the roles of TiN-nanoparticle inoculant in additively manufactured 316 stainless steel2024In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 175, p. 153-169Article in journal (Refereed)
    Abstract [en]

    As a potent grain refiner for steel casting, TiN is now widely used to refine γ-austenite in steel additive manufacturing (AM). However, the refining mechanism of TiN during AM remains unclear despite intensive research in recent years. This work aims to boost our understanding on the mechanism of TiN in refining the γ-austenite in AM-fabricated 316 stainless steel and its corresponding effect on the mechanical behaviour. Experimental results show that addition of 1 wt.% TiN nanoparticles led to complete columnar-to-equiaxed transition and significant refinement of the austenite grains to ∼2 µm in the 316 steel. Thermodynamic and kinetic simulations confirmed that, despite the rapid AM solidification, δ-ferrite is the primary solid phase during AM of the 316 steel and γ-austenite forms through subsequent peritectic reaction or direct transformation from the δ-ferrite. This implies that the TiN nanoparticles actually refined the δ-ferrite through promoting its heterogenous nucleation, which in turn refined the γ-austenite. This assumption is verified by the high grain refining efficiency of TiN nanoparticles in an AM-fabricated Fe-4 wt.%Si δ-ferrite alloy, in which δ-ferrite forms directly from the melt and is retained at room temperature. The grain refinement is attributed to the good atomic matching between δ-ferrite and TiN. Grain refinement in the 316 steel through 1 wt.% TiN inoculation not only eliminated the property anisotropy but also led to a high strain-hardening rate upon plastic deformation and thereby a superior strength-ductility synergy with yield strength of 561 MPa, tensile strength of 860 MPa and elongation of 48%.

  • 11.
    Wan, Yi
    et al.
    Shandong Univ, Sch Mech Engn, Key Lab High Efficiency & Clean Mfg, Jinan 250061, Peoples R China..
    Zhao, Zihe
    Shandong Univ, Sch Mech Engn, Key Lab High Efficiency & Clean Mfg, Jinan 250061, Peoples R China..
    Yu, Mingzhi
    Univ Coll Dublin, Sch Mech & Mat Engn, Ctr Micronano Mfg Technol MNMT Dublin, Dublin D04 KW52, Ireland..
    Ji, Zhenbing
    Shandong Univ, Sch Mech Engn, Key Lab High Efficiency & Clean Mfg, Jinan 250061, Peoples R China..
    Wang, Teng
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Neuronic Engineering.
    Cai, Yukui
    Shandong Univ, Sch Mech Engn, Key Lab High Efficiency & Clean Mfg, Jinan 250061, Peoples R China..
    Liu, Chao
    Shandong Univ, Qilu Hosp, Dept Oral & Maxilofacial Surg, Jinan 250012, Peoples R China.;Shanghai Jiao Tong Univ, Sch Med, Shanghai Peoples Hosp 9, Dept Oral Surg, Shanghai 200011, Peoples R China.;Shanghai Jiao Tong Univ, Coll Stomatol, Shanghai 200011, Peoples R China.;Natl Ctr Stomatol, Shanghai 200011, Peoples R China.;Natl Clin Res Ctr Oral Dis, Shanghai 200011, Peoples R China.;Shanghai Key Lab Stomatol, Shanghai 200011, Peoples R China..
    Liu, Zhanqiang
    Shandong Univ, Sch Mech Engn, Key Lab High Efficiency & Clean Mfg, Jinan 250061, Peoples R China..
    Osteogenic and antibacterial ability of micro-nano structures coated with ZnO on Ti-6Al-4V implant fabricated by two-step laser processing2022In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 131, p. 240-252Article in journal (Refereed)
    Abstract [en]

    The biological performance of Ti-6Al-4V implant is primarily determined by their surface properties. However, traditional surface modification methods, such as acid etching, hardly make improvement in their osseointegration ability and antibacterial capacity. In this study, we prepared a multi-scale composite structure coated with zinc oxide (ZnO) on Ti-6Al-4V implant by an innovative technology of two-step laser processing combined with solution-assistant. Compared with the acid etching method, the physicochemical properties of surface significantly improved. The in vitro results showed that the particular dimension of micro-nano structure and the multifaceted nature of ZnO synergistically affected MC3T3-E1 osteogenesis and bacterial activities: (1) The surface morphology showed a 'contact guidance' effect on cell arrangement, which was conducive to the adhesion of filopodia and cell spreading, and the osteogenesis level of MC3T3-E1 was enhanced due to the release of zinc ions (Zn2+); (2) the characterization of bacterial response revealed that periodic nanostructures and Zn2+ released could cause damage to the cell wall of E. coli and reduce the adhesion and aggregation of S. aureus. In conclusion, the modified surface showed a synergistic effect of physical topography and chemical composition, making this a promising method and providing new insight into bone defect repairment.

  • 12.
    Wang, Chenchong
    et al.
    Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China..
    Zhu, Kaiyu
    Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China..
    Hedström, Peter
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Properties.
    Li, Yong
    Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China..
    Xu, Wei
    Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China..
    A generic and extensible model for the martensite start temperature incorporating thermodynamic data mining and deep learning framework2022In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 128, p. 31-43Article in journal (Refereed)
    Abstract [en]

    The martensite start temperature is a critical parameter for steels with metastable austenite. Although numerous models have been developed to predict the martensite start (M-s) temperature, the complexity of the martensitic transformation greatly limits their performance and extensibility. In this work, we apply deep data mining of thermodynamic calculations and deep learning to develop a generic model for M-s prediction. Deep data mining was used to establish a hierarchical database with three levels of information. Then, a convolutional neural network model, which can accurately treat the hierarchical data structure, was used to obtain the final model. By integrating thermodynamic calculations, traditional machine learning and deep learning modeling, the final predictor model shows excellent generalizability and extensibility, i.e. model performance both within and beyond the composition range of the original database. The effects of 15 alloying elements were considered successfully using the proposed methodology. The work suggests that, with the help of deep data mining considering the physical mechanisms, deep learning methods can partially mitigate the challenge with limited data in materials science and provide a means for solving complex problems with small databases.

  • 13.
    Yang, Zhibiao
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Adv High Temp Mat & Precis Formi, Shanghai 200240, Peoples R China..
    Lu, Song
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Properties.
    Tian, Yanzhong
    Northeastern Univ, Sch Mat Sci & Engn, Key Lab Anisotropy & Texture Mat, Minist Educ, Shenyang 110819, Peoples R China..
    Gu, Zijian
    Northeastern Univ, Sch Mat Sci & Engn, Key Lab Anisotropy & Texture Mat, Minist Educ, Shenyang 110819, Peoples R China..
    Mao, Huahai
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Structures. Thermocalc Software, Rasundav 18, SE-16767 Solna, Sweden..
    Sun, Jian
    Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Adv High Temp Mat & Precis Formi, Shanghai 200240, Peoples R China..
    Vitos, Levente
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Properties. Uppsala Univ, Dept Phys & Mat Sci, Div Mat Theory, POB 516, SE-75120 Uppsala, Sweden.;Wigner Res Ctr Phys, Res Inst Solid State Phys & Opt, POB 49, H-1525 Budapest, Hungary..
    Assessing the magnetic order dependent gamma-surface of Cr-Co-Ni alloys2021In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 80, p. 66-74Article in journal (Refereed)
    Abstract [en]

    In order to efficiently explore the nearly infinite composition space in multicomponent solid solution alloys for reaching higher mechanical performance, it is important to establish predictive design strategies using computation-aided methods. Here, using ab initio calculations we systematically study the effects of magnetism and chemical composition on the generalized stacking fault energy surface (gamma-surface) of Cr-Co-Ni medium entropy alloys and show that both chemistry and the coupled magnetic state strongly affect the gamma-surface, consequently, the primary deformation modes. The relations among various stable and unstable stacking fault energies are revealed and discussed. The present findings are useful for studying the deformation behaviors of Cr-Co-Ni alloys and facilitate a density functional theory based design of transformation-induced plasticity and twinning-induced plasticity mechanisms in Cr-Co-Ni alloys.

  • 14.
    Yang, Zhibiao
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Adv High Temp Mat & Precis Formi, Shanghai 200240, Peoples R China.
    Lu, Song
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Properties.
    Tian, Yanzhong
    Northeastern Univ, Sch Mat Sci & Engn, Key Lab Anisotropy & Texture Mat, Minist Educ, Shenyang 110819, Peoples R China..
    Gu, Zijian
    Northeastern Univ, Sch Mat Sci & Engn, Key Lab Anisotropy & Texture Mat, Minist Educ, Shenyang 110819, Peoples R China..
    Sun, Jian
    Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Adv High Temp Mat & Precis Formi, Shanghai 200240, Peoples R China..
    Vitos, Levente
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Properties. Uppsala Univ, Div Mat Theory, Dept Phys & Mat Sci, POB 516, SE-75120 Uppsala, Sweden.;Wigner Res Ctr Phys, Res Inst Solid State Phys & Opt, POB 49, H-1525 Budapest, Hungary..
    Theoretical and experimental study of phase transformation and twinning behavior in metastable high-entropy alloys2022In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 99, p. 161-168Article in journal (Refereed)
    Abstract [en]

    Combined theoretical and experimental efforts are put forward to study the critical factors influencing deformation mode transitions in face-centered cubic materials. We revisit the empirical relationship between the stacking fault energy (SFE) and the prevalent deformation mechanism. With ab initio calculated SFE, we establish the critical boundaries between various deformation modes in the model Cr-CoNi solid solution alloys. Satisfying agreement between theoretical predictions and experimental observations are reached. Our findings shield light on applying quantum mechanical calculations in designing transformation-induced plasticity and twinning-induced plasticity mechanisms for achieving advanced mechanical properties.

  • 15.
    Yu, Peng
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
    Ma, Weimin
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
    A modified theta projection model for creep behavior of RPV steel 16MND52020In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 47, p. 231-242Article in journal (Refereed)
    Abstract [en]

    During a hypothetical severe accident of light water reactors, the reactor pressure vessel (RPV) could fail due to its creep under the influence of high-temperature corium. Hence, modelling of creep behavior of the RPV is paramount to reactor safety analysis since it predicts the transition point of accident progression from in-vessel to ex-vessel phase. In the present study we proposed a new creep model for the classical French RPV steel 16MND5, which is adapted from the “theta-projection model” and contains all three stages of a creep process. Creep curves are expressed as a function of time with five model parameters θi(i=1−4  and  m). A model parameter dataset was constructed by fitting experimental creep curves into this function. To correlate the creep curves for different temperatures and stress loads, we directly interpolate the model’s parameters θi(i=1−4  and m) from this dataset, in contrast to the conventional “theta-projection model” which employs an extra single correlation for each θi(i=1−4 and m), to better accommodate all experimental curves over the wide ranges of temperature and stress loads. We also put a constraint on the trend of the creep strain that it would monotonically increase with temperature and stress load. A good agreement was achieved between each experimental creep curve and corresponding model’s prediction. The widely used time-hardening and strain-hardening models were performing reasonably well in the new method.

  • 16.
    Yue, Xiaoqi
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.
    Chen, Dihao
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science. University of Science & Technology Beijing, Institute of Advanced Materials & Technology, Beijing 100083 China.
    Krishnan, Anantha
    cUddeholms AB, Hagfors, 683 85 Sweden.
    Lazar, Isac
    dLund University, Division of Synchrotron Radiation Research, Lund, 221 00 Sweden.
    Niu, Yuran
    eMAX IV Laboratory, Lund University, Lund, 221 00 Sweden.
    Golias, Evangelos
    eMAX IV Laboratory, Lund University, Lund, 221 00 Sweden.
    Wiemann, Carsten
    fPeter Grünberg Institute (PGI-6), Research Center Jülich, Jülich, D-52425 Germany.
    Gloskovskii, Andrei
    gGermany Centre for X-ray and Nano Science (CXNS), Deutsches Elektronen-Synchrotron DESY, Hamburg, 226 07, Germany, Hamburg.
    Schlueter, Christoph
    gGermany Centre for X-ray and Nano Science (CXNS), Deutsches Elektronen-Synchrotron DESY, Hamburg, 226 07, Germany, Hamburg.
    Jeromin, Arno
    gGermany Centre for X-ray and Nano Science (CXNS), Deutsches Elektronen-Synchrotron DESY, Hamburg, 226 07, Germany, Hamburg.
    Keller, Thomas F.
    gGermany Centre for X-ray and Nano Science (CXNS), Deutsches Elektronen-Synchrotron DESY, Hamburg, 226 07, Germany, Hamburg; hDepartment of Physics, Hamburg University, Hamburg, 201 48 Germany, Hamburg.
    Tong, Haijie
    iInstitute of Surface Science, Helmholtz-Zentrum Hereon, Geesthacht, 215 02 Germany.
    Ejnermark, Sebastian
    cUddeholms AB, Hagfors, 683 85 Sweden.
    Pan, Jinshan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.
    Unveiling nano-scale chemical inhomogeneity in surface oxide films formed on V- and N-containing martensite stainless steel by synchrotron X-ray photoelectron emission spectroscopy/microscopy and microscopic X-ray absorption spectroscopy2025In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 205, p. 191-203Article in journal (Refereed)
    Abstract [en]

    Nano-scale chemical inhomogeneity in surface oxide films formed on a V- and N-containing martensite stainless steel and tempering heating induced changes are investigated by a combination of synchrotron- based hard X-ray Photoelectron emission spectroscopy (HAXPES) and microscopy (HAXPEEM) as well as microscopic X-ray absorption spectroscopy (μ-XAS) techniques. The results reveal the inhomogeneity in the oxide films on the micron-sized Cr2N- and VN-type particles, while the inhomogeneity on the martensite matrix phase exists due to localised formation of nano-sized tempering nitride particles at 600 °C. The oxide film formed on Cr2N-type particles is rich in Cr2O3 compared with that on the martensite matrix and VN-type particles. With the increase of tempering temperature, Cr2O3 formation is faster for the oxidation of Cr in the martensite matrix than the oxidation of Cr nitride-rich particles.

  • 17.
    Yue, Xiaoqi
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science. Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China; Shunde Graduate School, University of Science and Technology Beijing, Foshan, 528399, China.
    Yang, Zhile
    Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing 100083, Peoples R China..
    Huang, Luyao
    Global Energy Interconnect Res Inst Co Ltd, State Key Lab Adv Power Transmiss Technol, Beijing 102209, Peoples R China..
    Zhang, Lei
    Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing 100083, Peoples R China..
    Li, Jun
    Shanxi Taigang Stainless Steel Co Ltd, Taiyuan 030003, Peoples R China..
    Xue, Zhaozhan
    Shanxi Taigang Stainless Steel Co Ltd, Taiyuan 030003, Peoples R China..
    Pan, Jinshan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.
    Passivation characteristics of ultra-thin 316L foil in NaCl solutions2022In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 127, p. 192-205Article in journal (Refereed)
    Abstract [en]

    Electrochemical behaviour and passive film characteristics of an ultra-thin 316L foil with a thickness of 20 ??m in 3.5 wt.% NaCl solution were investigated using multiple techniques, focusing on the effect of microstructure, the applied potential, and the pH of the solution. The microstructure contains mainly fine grains ( ???4 ??m) with high-angle boundaries and preferential orientation of (220), and no MnS inclusion was detected. The electrochemical measurements show a significantly higher breakdown potential and lower passive current density for the 316L foil than traditional wrought 316L. The surface analyses using angle-resolved X-ray photoelectron spectroscopy (ARXPS) and time-of-flight secondary ion mass spectroscopy (TOF-SIMS) reveal that, compared to the wrought material, both the inner and out parts of the passive film on the 316L foil are more enriched in Cr- and Mo-oxides. The microstructure favourable for elemental diffusion and the absence of MnS inclusion facilitate the formation of a continuous compact Cr- and Mo-rich passive film, which effectively retards corrosion in NaCl solution and remains stable in acidic solution (pH 2) or at high polarised potential up to 600 mV vs Ag/AgCl. ?? 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology. This is an open access article under the CC BY license ( http://creativecommons.org/licenses/by/4.0/ )

  • 18. Zhang, B.
    et al.
    Duan, Y.
    Zhang, H.
    Huang, Shuo
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Ma, G.
    Wang, T.
    Dong, Xinglong
    Jia, N.
    Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116085, China b Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Material Science and Engineering, Northeastern University, Shenyang, 110819, China.
    Magnetic transformation of Mn from anti-ferromagnetism to ferromagnetism in FeCoNiZMnx (Z = Si, Al, Sn, Ge) high entropy alloys2021In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 68, p. 124-131Article in journal (Refereed)
    Abstract [en]

    We design high entropy alloys (HEAs) with different induction elements (Si/Al/Sn). In order to keep the crystal structure invariant and to investigate how the increment in saturation magnetization (Ms) is caused only by the change of electron spin state, each set of HEAs contains a different amount of Mn. Synergistic effects among induction elements that induce the magnetic transformation of Mn from anti-ferromagnetism to ferromagnetism are found. Ms of added Mn reduces when a particular induction element (Si0.4/Al0.4/Sn0.4) exists, while a larger increment of Ms appears when two induction elements coexist, Si0.4Al0.4 (25.79 emu/g) and Sn0.4Al0.4 (15.43 emu/g). This is reflected in the microcosmic magnetic structure for the emergence of closed domains due to large demagnetization energy, which is confirmed by the Lorentz transmission electron microscope (LTEM) data. The calculated magnetic moments and the exchange integral constants from density functional theory based on the Exact Muffin-Tin Orbits formalism reveal that the magnetic state and the strength of ferromagnetic and anti-ferromagnetic coupling determine the variation of Ms in different chemical environments. The difference in energy levels of coexisting multiple induction elements also leads to a larger increment of Ms, Si0.4Al0.4Sn0.4 (29.78 emu/g), and Si0.4Al0.4Ge0.4Sn0.4 (31.00 emu/g).

  • 19.
    Zhang, H. L.
    et al.
    Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China.;Xi An Jiao Tong Univ, Coll Stomatol, Key Lab Shaanxi Prov Craniofacial Precis Med Res, Xian 710049, Peoples R China..
    Cai, D. D.
    Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China..
    Sun, X.
    Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China..
    Huang, H.
    Sci & Technol Surface Phys & Chem Lab, Jiangyou 621908, Peoples R China..
    Lu, Song
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Properties.
    Wang, Y. Z.
    Ohio State Univ, Dept Mat Sci & Engn, 2041 Coll Rd, Columbus, OH 43210 USA..
    Hu, Q. M.
    Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China..
    Vitos, Levente
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Properties.
    Ding, X. D.
    Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China..
    Solid solution strengthening of high-entropy alloys from first-principles study2022In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 121, p. 105-116Article in journal (Refereed)
    Abstract [en]

    Solid solution strengthening (SSS) is one kind of strengthening mechanisms and plays an important role in alloy design, in particular for single-phase alloys including high-entropy alloys (HEAs). The classical Labusch-Nabarro model and its expansions are most widely applicable to treating SSS of solid solution alloys including both conventional alloys (CAs) and HEAs. In this study, the SSS effects in a series of Fe based CAs and HEAs are investigated by using the classical Labusch-Nabarro model and its expansions. The size misfit and shear modulus misfit parameters are derived from first-principles calculations. Based on available experimental data in combination with empirical SSS model, we propose fitting constants (i.e., the ratio between experimental hardness and predicted SSS effect) for these two families of alloys. The predicted host/alloy family-dependent fitting constants can be used to estimate the hardness of these SSS alloys. General agreement between predicted and measured hardness values is satisfactory for both CAs and HEAs, implying that the proposed approach is reliable and successful.

  • 20. Zhang, H.
    et al.
    Li, Z. C.
    Bergman, Bill
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Ceramics.
    Zou, X. D.
    Investigation of La9.33Si6O26 oxygen ionic conductor2007In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 23, no 5, p. 629-632Article in journal (Refereed)
    Abstract [en]

    La9.33Si6O26 oxygen ionic conductor was synthesized by solid state reaction method. Its structure was determined by single-crystal X-ray diffraction analysis at room temperature. The results showed that La9.33Si6O26 oxide has the apatite structure with space group P6(3)/m. AC impedance measurements indicated that the oxides sintered in nitrogen have much higher conductivity than those sintered in air. The effects of grain boundaries on the conductivity were discussed.

  • 21.
    Zhang, Ting
    et al.
    Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China.;Xian Univ Architecture & Technol, Sch Met Engn, Xian 710055, Peoples R China..
    Wei, Daixiu
    Tohoku Univ, Inst Mat Res, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan..
    Lu, Eryi
    Shanghai Jiao Tong Univ, Renji Hosp, Sch Med, Dept Stomatol, Shanghai 200127, Peoples R China..
    Wang, Wen
    Xian Univ Architecture & Technol, Sch Met Engn, Xian 710055, Peoples R China..
    Wang, Kuaishe
    Xian Univ Architecture & Technol, Sch Met Engn, Xian 710055, Peoples R China..
    Li, Xiaoqing
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Properties.
    Zhang, Lai-Chang
    Edith Cowan Univ, Sch Engn, 270 Joondalup Dr, Perth, WA 6027, Australia..
    Kato, Hidemi
    Tohoku Univ, Inst Mat Res, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan..
    Lu, Weijie
    Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China..
    Wang, Liqiang
    Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China..
    Microstructure evolution and deformation mechanism of alpha plus beta dual-phase Ti-xNb-yTa-2Zr alloys with high performance2022In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 131, p. 68-81Article in journal (Refereed)
    Abstract [en]

    Biomedical beta-phase Ti-Nb-Ta-Zr alloys usually exhibit low elastic modulus with inadequate strength. In the present work, a series of newly developed dual-phase Ti-xNb-yTa-2Zr (wt.%) alloys with high performance were investigated in which the stability of beta-phase was reduced under the guidelines of ab initio calculations and d-electronic theory. The effects of Nb and Ta contents on the microstructure, compressive and tensile properties were investigated. Results demonstrate that the designed Ti-xNb-yTa-2Zr alloys exhibit typical characteristics of alpha+beta dual-phase microstructure. The microstructure of the alloys is more sensitive to Nb rather than Ta. The as-cast alloys exhibit needle-like alpha' martensite at a lower Nb content of 3 wt.% and lamellar alpha' martensite at an Nb content of 5 wt.%. Among the alloys, the Ti-3Nb-13Ta-2Zr alloy shows the highest compressive strength (2270 +/- 10 MPa) and compressive strain (74.3% +/- 0.4%). This superior performance is due to the combination of alpha+beta dual-phase microstructure and stress-induced alpha '' martensite. Besides, lattice distortion caused by Ta element also contributes to the compressive properties. Nb and Ta contents of the alloys strongly affect Young's modulus and tensile properties after rolling. The as-rolled Ti-3Nb-13Ta-2Zr alloy exhibits much lower modulus due to lower Nb content as well as more alpha '' martensite and beta phase with a good combination of low modulus and high strength among all the designed alloys. Atom probe tomography analysis reveals the element partitioning between the a and beta phases in which Ta concentration is higher than Nb in the alpha phase. Also, the concentration of Ta is lower than that of Nb in the beta phase, indicating that the beta-stability of Nb is higher than that of Ta. This work proposes modern alpha+beta dual-phase Ti-xNb-yTa-2Zr alloys as a new concept to design novel biomedical Ti alloys with high performance.

1 - 21 of 21
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf