Thermodynamic assessment of the Fe-Nb-V system

The Fe-Nb-V system is modeled thermodynamically for the first time employing thermodynamic descriptions of limiting binary systems from literature. Enthalpies of formation for hypothetical end members were calculated using ab initio methods with the aim to describe the solubility of V in the Fe-Nb C14 Laves and µ phases as well as the solubility of Nb in the Fe-V σ phase. A small number of parameters were optimized taking into account data from ab initio calculations and existing experimental data for the ternary system. The results are in good agreement with the few existing experimental investigations.