Evaluation of the thermodynamic properties of the Re-Ta and Re-W systems

The phase equilibria and thermodynamic properties of the Re-Ta and Re-W systems were analyzed and complete thermodynamic descriptions of the two binary systems were obtained with the CALPHAD technique using a computerized optimization procedure. The thermodynamic descriptions of pure Re, Ta and W elements were taken from the SGTE database. Two binary intermetallic compounds were considered in both binary systems, namely σ phase and χ phase based on available experimental data. Good agreement was obtained between calculated results and experimental data in the two binary systems.