Thermodynamic assessment of the Co-Ta system

The phase equilibria and thermodynamic properties of the binary Co-Ta syste m were analyzed and a complete thermodynamic description of the binary syst em was obtained with the CALPHAD technique using a computerized optimizatio n procedure. The thermodynamic descriptions of pure Co and Ta elements were taken from the SGTE database. Based on the experimental data, six binary i ntermetallic compounds were considered. They are three Laves phases, mu pha se, theta phase and Co7Ta2 phase. The last two compounds are treated as sto ichiometric compounds. Good agreement was obtained between calculated resul ts and experimental data in the binary system.