Abstract
Based on the thermodynamic descriptions of constitutive binary systems as well as the experimental phase equilibria data available in the literature, the Ti-W-M (M = Zr, Mo, Nb) ternary systems have been thermodynamically evaluated by the CALPHAD (CALculation of PHAse Diagram) approach. The solution phases, i.e. liquid and bcc, are described by the substitutional solution model. The binary phase W2Zr with the solubilities of Ti is modeled using the sublattice model. A set of self-consistent thermodynamic parameters is finally obtained for each of these ternary systems. Some representative isothermal and vertical sections are calculated. Comparisons between the calculated and measured phase diagrams show that the most of experimental data are satisfactorily reproduced by the present thermodynamic descriptions.
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