Effects of elastic strain energy on the antisite defect of D022–Ni3V phase

A time-dependent phase field microelasticity model of an elastically anisotropic Ni–Al–V solid is employed for a D022–Ni3V antisite defect application. The elastic strain energy (ESE), caused by a coherent misfit, changes the behavior of the temporal evolution occupancy probability (OP), slows down the phase transformation, and eventually leads to directional coarsening of coherent microstructures. In particular, for the antisite defects (NiV, VNi) and ternary alloying elements (AlNi, AlV), ESE is responsible for the decrease in the calculated equilibrium values of NiV, AlNi, and AlV, as well as the increase in the equilibrium value of VNi. The gap between NiV and VNi and AlNi and AlV is narrowed in the system involving ESE, but the calculated equilibrium magnitude of NiV is still greater than that of VNi. The calculated equilibrium magnitude of AlNi was always greater than AlV in this study.