Simulation of interphase boundary of Ni75AlxV25-x alloys using microscopic phase-field method

The evolution of ordered interphase boundary (IPB) of Ni75AlxV25-x alloys was simulated using the microscopic phase-field method. Based on the atomic occupation probability figure on 2D and order parameters, it was found that the IPB formed by different directions of θ phase has great effect on the precipitation of γ′ phase. The γ′ phase precipitated at the IPB that is formed by [100]θ direction where the (001)θ plane is opposite, and then grows up and the shape is strap at final. The IPB structure between γ′ phase and θ phase is the same. There is no γ′ phase precipitate at the IPB where the (002)θ and (001)θ planes are opposite, the ordered IPB is dissolved into disordered area. There is γ′ phase precipitation at the IPB formed by the [001]θ and [100]θ directions, and the IPB structure is different between γ′ phase and the different directions of θ phase. The IPB where (001)γ′ and (100)θ plane opposite does not migrate during the γ′ phase growth, and γ′ phase grows along [100]θ direction.