Thermodynamic modeling of the Ni–Nb–V ternary system

Abstract The Ni–Nb–V ternary system has been assessed by means of the CALPHAD approach. All of the experimental phase diagram and thermodynamic data available from the literature are critically reviewed. The liquid, (Ni), (Nb), and (V) are modeled as substitutional solution phases, while the intermetallic compounds including Ni3Nb, (μ), Ni3V, Ni2V, (σ) and Ni2V7 are described by using corresponding sublattice models. According to the crystallographic data, the ternary compound (λ) with Laves_C14 structure is modeled using two-sublattice (Nb,Ni,V)2(Nb,Ni,V)1 to describe its homogeneity range. The modeling of the Ni–Nb–V system covers the entire composition and temperature ranges, and a set of self-consistent thermodynamic parameters for the Ni–Nb–V ternary system has been obtained. Comprehensive comparisons between the present calculations and measured phase diagrams show that the reliable experimental information is satisfactorily accounted for by the present thermodynamic description. The liquidus projection and reaction scheme of the Ni–Nb–V ternary system have also been presented.