Reassessment of the Ni–V system and a new thermodynamic modeling of the Mo–Ni–V system

Highlights: • The σ phase is described by a three-sublattice (Ni,V)₁₀V₄(Ni,V)₁₆. • The Ni–V and Mo–Ni–V systems have been critically modeled. • An application of the Mo–Ni–V system as nuclear structural material is discussed. - Abstract: The Mo–Ni–V system has been assessed by means of the CALPHAD (CALculation of PHAse Diagram) approach. The binary system Ni–V was reassessed by considering all available thermochemical and phase diagram data. According to the crystallographic data, the σ intermediate compound is described by a three-sublattice (Ni,V)₁₀V₄(Ni,V)₁₆. Calculated phase diagram and thermochemical properties of the Ni–V system showed a good agreement with experimental data. A set of self-consistent thermodynamic parameter for the Mo–Ni–V system was obtained by considering the phase diagram data in the ternary system. Comprehensive comparisons between the calculated and measured phase diagram and thermodynamic data showed that the experimental information was satisfactorily accounted for by the present thermodynamic description.