Thermodynamic re-assessment of the V–C system

The present paper develops a set of thermodynamic parameters based on the CALPHAD approach, using all available experimental data and applying thermodynamic models. The liquid phase is modeled with the Redlich–Kister polynomial. The solid solution phases, the hcp-(V2C), fcc-(VCx) and bcc-(V) are described by the sublattice model. The compound V4C3−x and the ordered phase V8C7 are treated as the stoichiometric phases. The order–disorder transformation between the disordered phase fcc-(VCx) and the ordered phase V6C5, which is described by the three-sublattice model, V1(C,Va)0.833333(C,Va)0.166667, is especially considered in this work. The calculated results agree well with experiments.