Computer simulation of the interphase boundary evolution in Ni₇₅Al_xV_25-x alloy

The interphase boundary evolution of ordered phase in Ni₇₅Al_xV_25-x alloy during precipitation was simulated on atomic-scale based on the microscopic phase-field dynamic model. The results show that the second phase precipitated from the interphase boundary formed by the first phase and the disordered matrix at high temperature, and from the interphase boundaries of the first phase at low temperature. L1₂ phase had obvious selective orientation when precipitated from the interphase boundaries of D0₂₂. L1₂ phase nucleated easily at the interphase boundaries formed by [10] and [01] directions of D0₂₂ projection along [001] direction, and grew easily at [10] direction. There was no the selective orientation when L1₂ phase precipitated from the interphase boundary formed by D0₂₂ and the disordered matrix. D0₂₂ phase had the selective orientation when precipitated from the interphase boundaries of Ll₂, and grew along the [10] direction.