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 D0(22)-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 VNi. The gap between Ni-V and V-Ni and Al-Vi 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 AIM was always greater than Al-V in this study. (C) 2009 Elsevier B.V. All rights reserved.