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 (Ni_V, V_Ni) and ternary alloying elements (Al_Ni, Al_V), ESE is responsible for the decrease in the calculated equilibrium values of Ni_V, Al_Ni, and Al_V, as well as the increase in the equilibrium value of V_Ni. The gap between Ni_V and V_Ni and Al_Ni and Al_V is narrowed in the system involving ESE, but the calculated equilibrium magnitude of Ni_V is still greater than that of V_Ni. The calculated equilibrium magnitude of Al_Ni was always greater than Al_V in this study.