The Application of the Model of (Juasi-ideal Associated Solutions to the Calculation of the Thermodynamics of Ternary Melts

Крылов, А. В.; Katsnelson, Alexander M.

doi:10.1515/ijmr-1993-840912

Cited by 2 publications

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“…19,20 On the other hand, the metallic bonding in the Ni-Zr alloy, evidently, cannot be ignored, and should be considered in the above context as an excess interaction. Thus, the expression for the Gibbs energy of formation of the Ni-Zr associated liquid will be following: 17,21…”

Section: Thermodynamic Model Of the Ni-zr Meltsmentioning

confidence: 99%

Thermodynamic properties and phase equilibria in the nickel–zirconium system. The liquid to amorphous state transition

Зайцев¹,

Zaitseva²,

Shakhpazov³

et al. 2002

Phys. Chem. Chem. Phys.

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The vapour composition and the thermodynamic properties of Ni-Zr alloys in the liquid and solid states were studied by Knudsen-cell mass spectrometry over wide ranges of temperature (971-1896 K) and composition (0-99.8 mol% Zr). The accessible temperature range was enhanced by chemically generating volatile substances directly in the cell. For this purpose, the samples were mixed with powdered fluorides of magnesium, calcium, or sodium. Reduction reactions occurring in the cell produced zirconium fluorides, which were examined with the mass spectrometer. The thermodynamic functions of formation of all crystalline phases in the Ni-Zr system were determined. A representative file of experimental data was obtained for the Ni-Zr melt. It comprises about 900 values of the activities of both components at various concentrations and temperatures. The concentration and temperature dependences of the thermodynamic functions of liquid Ni-Zr alloy were described by the associated-solutions model under the assumption that NiZr, Ni 2 Zr and Ni 3 Zr associates exist in the melt. The phase equilibria computed on the basis of the obtained thermodynamic properties and the developed model are shown to agree with available experimental information. The nature of the interparticle interaction in the Ni-Zr system was analysed and the behaviour of the thermodynamic functions accompanying the process of transition of the Ni-Zr melt into the amorphous state was considered. Quantitative agreement with the independent experimental results was obtained.

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