Phase-field study for the pre-precipitation process of L1 ₂-Ni₃Al phase in Ni-Al-V alloy

The microscopic phase-field dynamic model is employed to study the pre-precipitation process of Ni-Al-V alloy. Our computer simulation results show that there exists pre-precipitated phase with L1₀ structure before L1₂ phase formed, temperature and elastic strain energy play significant effect on the pre-precipitated phase with L1₀ structure. The elastic strain energy can induce the formation of L1₀ pre-precipitated phase. Under the same temperature, the greater the elastic strain energy is, the easier L1₀ pre-precipitated phase will form; under the same elastic strain energy, with the temperature increasing, the incubation period and existent time of L1₀ pre-precipitate phase are prolonged, the number of L1₀ precipitated phase also increases, and the formation of the L1₂ phase are delayed.