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  • 1.
    Antonsson, Tomas
    et al.
    KTH, Superseded Departments, Casting of Metals.
    Ekbom, Lars B.
    KTH, Superseded Departments, Casting of Metals.
    Eliasson, Anders
    KTH, Superseded Departments, Casting of Metals.
    Fredriksson, Hasse
    KTH, Superseded Departments, Casting of Metals.
    Liquid Ni-Fe penetration and recrystallisation in tungsten2003In: International journal of refractory metals & hard materials, ISSN 0958-0611, E-ISSN 2213-3917, Vol. 21, no 3-4, p. 159-170Article in journal (Refereed)
    Abstract [en]

    Melt penetration in grain boundaries of solid tungsten has been investigated. Solid tungsten rods have been exposed to a nickel-iron melt saturated with tungsten and the penetration depth and the shape of the liquid channels have been examined. The solid tungsten samples have been treated in different ways like cold working, annealing and recrystallisation, before melt exposure. Important parameters for the penetration process are stresses, surface tensions, solution and kinetic effects. A new theoretical model for the penetration mechanism in cold worked samples is proposed. Rapid recovery of the grains in the penetrated areas of the cold worked samples was observed. This is discussed, as well.

  • 2.
    Ekbom, Lars B.
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Antonsson, Tomas
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Ekbom, M
    Computer simulation of solution and growth processes during the initial stage of liquid phase sintering of tungsten heavy metal2005In: Scandinavian journal of metallurgy, ISSN 0371-0459, E-ISSN 1600-0692, Vol. 34, no 5, p. 312-316Article in journal (Refereed)
    Abstract [en]

    In the initial stage of liquid phase sintering, particle dissolution and growth processes occur. The melting matrix penetrates the solid particle agglomerates. A fraction of the particles dissolves in the liquid matrix phase and the original powder size will initially be reduced. At the same time the agglomerates of particles are effectively separated. In a second stage larger particles grow in equilibrium with the matrix, whilst smaller, pure particles dissolve into the matrix and the mean particle size increases. When an equilibrium is reached, the solid particles start to grow in the liquid matrix phase in accordance with the ripening process. The initial stages of liquid phase sintering have been investigated by short time sintering under microgravity and are presented in a series of micrographs. Mathematical models for the 3 stages have been developed. Computer simulations of these different stages in the solution and growth processes have been used to visualise the change in particle size distribution.

  • 3.
    Ekbom, Lars B
    et al.
    KTH, Superseded Departments, Materials Science and Engineering.
    Eliasson, Anders
    KTH, Superseded Departments, Materials Science and Engineering.
    Liquid Phase Sintering of Tungsten Composites1994In: Conference proceedings of the Sefström Symposium, Stockholm: KTH , 1994, p. 293-304Conference paper (Other academic)
  • 4.
    Ekbom, Lars B
    et al.
    KTH, Superseded Departments, Materials Science and Engineering.
    Eliasson, Anders
    KTH, Superseded Departments, Materials Science and Engineering.
    Liquid Phase Sintering of Tungsten Composites in Space: Results of Tests Performed in Texus1988In: Advances in Space Research, ISSN 0273-1177, E-ISSN 1879-1948, Vol. 8, no 12, p. 315-319Article in journal (Refereed)
  • 5.
    Ekbom, Lars B
    et al.
    KTH, Superseded Departments, Materials Science and Engineering.
    Eliasson, Anders
    KTH, Superseded Departments, Materials Science and Engineering.
    Liquid Phase Sintering of Tungsten Composites under Microgravity: Effect of Matrix Composition1992In: Microgravity Q., Vol. 2, no 4, p. 227-232Article in journal (Refereed)
  • 6.
    Ekbom, Lars B
    et al.
    KTH, Superseded Departments, Materials Science and Engineering.
    Eliasson, Anders
    KTH, Superseded Departments, Materials Science and Engineering.
    Liquid Phase Sintering of Tungsten Composites under Microgravity: Effect of Matrix Composition. Particle Growth1992In: Proc. Tungsten & Tungsten Alloys, p. 97-110Article in journal (Refereed)
  • 7.
    Ekbom, Lars B
    et al.
    KTH, Superseded Departments, Materials Science and Engineering.
    Eliasson, Anders
    KTH, Superseded Departments, Materials Science and Engineering.
    Liquid Phase Sintering under Microgravity in Space1988In: Modern developments in powder metallurgy, ISSN 0074-7513, Vol. 18-21, p. 63-Article in journal (Refereed)
  • 8.
    Ekbom, Lars B
    et al.
    KTH, Superseded Departments, Materials Science and Engineering.
    Eliasson, Anders
    KTH, Superseded Departments, Materials Science and Engineering.
    Fredriksson, Hasse
    KTH, Superseded Departments, Materials Science and Engineering.
    Liquid-phase Sintering of Tungsten Composites in Space. Agglomerate Separation and Particle Growth1989In: High Temperatures-High Pressures, ISSN 0018-1544, E-ISSN 1472-3441, Vol. 21, p. 507-514Article in journal (Refereed)
  • 9.
    Eliasson, Anders
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Ceramics.
    Ekbom, Lars B
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Fredriksson, Hasse
    Liquid Penetration and Particle Separation during the Initial Stage of Liquid Phase Sintering2006In: Metallurgical transactions. A, ISSN 0360-2133Article in journal (Refereed)
  • 10.
    Fredriksson, Hasse
    et al.
    KTH, Superseded Departments, Materials Science and Engineering.
    Eliasson, Anders
    KTH, Superseded Departments, Materials Science and Engineering.
    Ekbom, Lars B
    KTH, Superseded Departments, Materials Science and Engineering.
    Penetration of Tungsten Grain Boundaries by a Liquid Fe-Ni Matrix1995In: International Journal of Refractory Metals and Hard Materials, ISSN 0958-0611, Vol. 13, p. 173-179Article in journal (Refereed)
  • 11.
    Korojy, Bahman
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
    Ekbom, Lars
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
    Microsegregation and Solidification Shrinkage of Copper-Lead Base Alloys2009In: Advances in Materials Science and Engineering, ISSN 1687-6822Article in journal (Refereed)
    Abstract [en]

    Microsegregation and solidification shrinkage were studied on copper-lead base alloys. A series of solidification experiments was performed, using differential thermal analysis (DTA) to evaluate the solidification process. The chemical compositions of the different phases were measured via energy dispersive X-ray spectroscopy (EDS) for the Cu-Sn-Pb and the Cu-Sn-Zn-Pb systems. The results were compared with the calculated data according to Scheil's equation. The volume change during solidification was measured for the Cu-Pb and the Cu-Sn-Pb systems using a dilatometer that was developed to investigate the melting and solidification processes. A shrinkage model was used to explain the volume change during solidification. The theoretical model agreed reasonably well with the experimental results. The deviation appears to depend on the formation of lattice defects during the solidification process and consequently on the condensation of those defects at the end of the solidification process. The formation of lattice defects was supported by quenching experiments, giving a larger fraction of solid than expected from the equilibrium calculation.

  • 12.
    Korojy, Bahman
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Processing.
    Ekbom, Lars
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Processing.
    Fredriksson, Hasse
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Processing.
    On solidification shrinkage of copper-lead and copper-tin-lead alloys2009In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 22, no 1-4, p. 179-182Article in journal (Refereed)
    Abstract [en]

    Solidification shrinkage is an important concept in achieving sound castings. In the present work solidification shrinkage was studied in copper-lead and copper-lead-tin alloys. A series of solidification experiments was performed under different cooling rates using a dilatometer which was developed for melting and solidification purposes. The volume change was measured during primary solidification and the monotectic reaction. In order to explain the volume-changing results, the sample macrostructures were studied to evaluate gas and shrinkage cavities which were formed during the solidification. Furthermore, the volume fraction of the primary phase during solidification was evaluated in the samples that were quenched from different temperatures below the liquidus temperature. A shrinkage model was used to explain the volume changes during solidification.

  • 13. Lockowandt, C
    et al.
    Löth, K
    Ekbom, Lars B
    KTH, Superseded Departments, Materials Science and Engineering.
    Eliasson, Anders
    KTH, Superseded Departments, Materials Science and Engineering.
    Wollmar Jarfors, Anders
    KTH, Superseded Departments, Materials Science and Engineering.
    Microgravity Applications Furnace Facility, MAFF, for Parabolic Flights.1992In: Proc. VIIIth Europ. Symp. Mat. and Fluid Sci. in Microg, 1992, Vol. 1, p. 383-386Conference paper (Refereed)
1 - 13 of 13
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