Thermodynamic assessments of the phase diagrams of the hafnium-vanadium and vanadium-zirconium systems |
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Authors: | C Servant |
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Affiliation: | (1) Laboratoire de Physico-Chimie de l’Etat Solide, UMR 8648, Université de Paris-Sud, 91405 Orsay Cedex, France |
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Abstract: | Thermodynamic assessments have been made for the hafnium-vanadium (Hf-V) and vanadium-zirconium (V-Zr) systems using the Calphad-Thermocalc
approach. The Gibbs energies of the liquid, body-centered cubic, and close-packed hexagonal phases were described by a substitution
solution model with a Redlich-Kister formalism to express the excess Gibbs energy. The C15-Laves phase was treated first as stoichiometric and then with a composition range. A consistent set of optimized thermodynamic
parameters was obtained, and calculated phase equilibria were compared with the experimental data. The enthalpy of formation
of the C15-Laves phase was calculated equal to approximately −3 and −5 kJ/mol, respectively, in the Hf-V and V-Zr systems,
which is in good agreement with predicted values. |
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Keywords: | |
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