Thermodynamic assessment of the C-Nb-Mo system over the entire composition and temperature ranges

The C-Nb-Mo system was assessed by means of the CALPHAD (CALculation of PHAse Diagram) approach. All of the experimental phase diagram data available from the literature were critically reviewed, and the solution phases including liquid, fcc, hcp, bcc and (η) were described by substitutional solution model or sublattice model. The modeling of this system covers the whole composition range and wide temperature range from 25 to 3800 °C. There was no ternary compound reported in this system. A set of self-consistent thermodynamic parameters for the C-Nb-Mo system was finally obtained. Comprehensive comparisons between the calculated and measured phase diagram data show that the experimental information is satisfactorily accounted for by the present thermodynamic description. The liquidus projection and reaction scheme of the C-Nb-Mo system were also generated by using the present thermodynamic parameters.