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, γ(Co,Ni), ɛCo and αCr phases were described by a substitutional solution model. The σ phase was characterized by a three-sublattice model of (Co,Ni)8Cr4(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.