Thermodynamic assessment of the Cu-Ti-Zr system. III. Cu-Ti-Zr system

The thermodynamic assessment of the Cu-Ti-Zr system is carried out in the framework of the CALPHAD method. The Gibbs energy of the liquid alloys is described by the ideal associated solution model. The excess Gibbs energy of the solid solutions is described using the Redlich-Kister-Muggianu model. The Gibbs energy of intermetallic compounds with homogeneity region is described in the framework of the Compound Energy Formalism. A set of self-consistent parameters of models is obtained taking into account data on phase equilibria and thermodynamic properties of the liquid phase. The calculated isothermal and vertical sections of the phase diagram and liquidus and solidus surfaces are in satisfactory agreement with corresponding experimental data. Metastable transformations with participation of the supercooled liquid melts are calculated. Predicted concentration ranges of amorphization are in satisfactory agreement with experimental data.