Assessment of Co-Cr-Ni ternary system by CALPHAD technique

The Co-Cr-Ni ternary system was critically assessed using the CALPHAD technique. The solution phases including the liquid, gamma(Co,Ni), E > Co and alpha Cr phases were described by a substitutional solution model. The sigma phase was characterized by a three-sublattice model of (Co,Ni)(8)Cr-4(Co,Cr,Ni)(18) in order to reproduce its homogeneity range determined by experiments. A self-consistent set of thermodynamic parameters for each phase was derived.