Experimental procedure to determine the interdiffusion coefficient of miscibility gap liquid alloys: Case of GaPb system

The calculations of thermodynamic properties in some gallium-based systems with a miscibility gap ? Ga?Tl, Ga?Hg and Ga?Pb are presented in this paper. The determination of the gallium activities in the mentioned liquid alloys was based on their known phase diagrams using the Zhang-Chou method for calculating activities from phase diagrams involving two liquid or solid coexisting phases. The activities of gallium in Ga?Tl, Ga?Hg and Ga?Pb system were calculated in the 973?1273 K, 573?873 K and 1000?1100 K temperature ranges, respectively. The activities of the other component in all the investigated systems were obtained by the Gibbs-Duhem equation. The results of the calculations are compared with literature data.

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Virtual miscibility gap and interdiffusion coefficient in iron-nickel invar alloys

Journal of Magnetism and Magnetic Materials ◽

10.1016/0304-8853(79)90166-5 ◽

1979 ◽

Vol 10 (2-3) ◽

pp. 145-151 ◽

Cited By ~ 24

Author(s):

Y. Nakagawa ◽

Y. Tanji ◽

H. Morita ◽

H. Hiroyoshi ◽

H. Fujimori

Keyword(s):

Interdiffusion Coefficient ◽

Miscibility Gap ◽

Invar Alloys ◽

Iron Nickel

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Viscosity and Interdiffusion Coefficient of Liquid Alloys

Materia Japan ◽

10.2320/materia.58.612 ◽

2019 ◽

Vol 58 (11) ◽

pp. 612-615

Author(s):

Hidekazu Kobatake ◽

Elke Sondermann ◽

Jürgen Brillo

Keyword(s):

Interdiffusion Coefficient ◽

Liquid Alloys

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Improvement of a Measurement Method of Interdiffusion Coefficient of Liquid Alloys by Using the Foton Shear Cell and Verification of Darken^|^apos;s Equation in Liquid Alloys

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES AEROSPACE TECHNOLOGY JAPAN ◽

10.2322/tastj.12.ph_19 ◽

2014 ◽

Vol 12 (ists29) ◽

pp. Ph_19-Ph_24 ◽

Cited By ~ 1

Author(s):

Koji SUZUKI ◽

Noriyuki YAMADA ◽

Anna TANAKA ◽

Shinsuke SUZUKI

Keyword(s):

Interdiffusion Coefficient ◽

Measurement Method ◽

Liquid Alloys ◽

Shear Cell

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A Comparison of Tem and Apfim to the Interpretation of Modulated Microstructures

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010011742x ◽

1985 ◽

Vol 43 ◽

pp. 70-71

Author(s):

M.G. Burke ◽

M.K. Miller

Keyword(s):

Low Temperature ◽

Microstructural Characterization ◽

Superlattice Reflection ◽

High Volume ◽

Atom Probe ◽

Dark Field ◽

Miscibility Gap ◽

Second Phase ◽

Two Phase ◽

Probe Field

Interpretation of fine-scale microstructures containing high volume fractions of second phase is complex. In particular, microstructures developed through decomposition within low temperature miscibility gaps may be extremely fine. This paper compares the morphological interpretations of such complex microstructures by the high-resolution techniques of TEM and atom probe field-ion microscopy (APFIM).The Fe-25 at% Be alloy selected for this study was aged within the low temperature miscibility gap to form a <100> aligned two-phase microstructure. This triaxially modulated microstructure is composed of an Fe-rich ferrite phase and a B2-ordered Be-enriched phase. The microstructural characterization through conventional bright-field TEM is inadequate because of the many contributions to image contrast. The ordering reaction which accompanies spinodal decomposition in this alloy permits simplification of the image by the use of the centered dark field technique to image just one phase. A CDF image formed with a B2 superlattice reflection is shown in fig. 1. In this CDF micrograph, the the B2-ordered Be-enriched phase appears as bright regions in the darkly-imaging ferrite. By examining the specimen in a [001] orientation, the <100> nature of the modulations is evident.

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Transition alpha structure in beta-isomorphous Nb-Hf alloys

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100126068 ◽

1987 ◽

Vol 45 ◽

pp. 232-233

Author(s):

R.W. Carpenter ◽

Changhai Li ◽

David J. Smith

Keyword(s):

Solid Solution ◽

Solution Phase ◽

Miscibility Gap ◽

Large Strains ◽

Solid Solution Phase ◽

Two Phase ◽

Diffuse Intensity ◽

Metastable Form ◽

The Matrix ◽

Equilibrium Morphology

Binary Nb-Hf alloys exhibit a wide bcc solid solution phase field at temperatures above the Hfα→ß transition (2023K) and a two phase bcc+hcp field at lower temperatures. The β solvus exhibits a small slope above about 1500K, suggesting the possible existence of a miscibility gap. An earlier investigation showed that two morphological forms of precipitate occur during the bcc→hcp transformation. The equilibrium morphology is rod-type with axes along <113> bcc. The crystallographic habit of the rod precipitate follows the Burgers relations: {110}||{0001}, <112> || <1010>. The earlier metastable form, transition α, occurs as thin discs with {100} habit. The {100} discs induce large strains in the matrix. Selected area diffraction examination of regions ∼2 microns in diameter containing many disc precipitates showed that, a diffuse intensity distribution whose symmetry resembled the distribution of equilibrium α Bragg spots was associated with the disc precipitate.

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