Thermodynamic Description of the Co-Nb-V Ternary System

Thermodynamic calculations were performed in the Co-Nb-V ternary system on the isothermal sections at 1000 °C and 1200 °C, and several vertical sections at different compositional ranges were constructed using the CALPHAD methodology, drawing upon published experimental measurements. An internally consistent set of thermodynamic parameters describing the Gibbs free energies of the individual phases in the Co-Nb-V ternary system was established, yielding strong agreement between the calculated phase equilibria and reported experimental data. Furthermore, isothermal sections at other temperatures, along with the liquidus surface of the Co-Nb-V system, were subsequently calculated.