Microscopic phase-field simulation of influence of ageing temperature on raft in Ni-Al-V alloys

Based on the microscopic phase-field kinetic model and Ni₇₅Al_25-xV_x alloy, the influences of ageing temperature on the competitive growth mechanism and raft structure were studied. The results show that the growth and coarsening of phase is a competitive process. It will form raft structure when the number of DO₂₂ is less and the size is larger, causing L1₂ phase growing along the same direction. The precipitate phases appear earlier at a low temperature. There is more DO₂₂ grain and not obvious raft structure at lower temperature if L1₂ phase precipitates first. There is less DO₂₂ grain and obvious raft structure at lower temperature if DO₂₂ phase precipitates first.