Simulation of interphase boundary of Ni₇₅Al_xV_25-x alloys using microscopic phase-field method

The evolution of ordered interphase boundary (IPB) of Ni₇₅Al_xV_25-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.