Microscopic phase-field simulation for rafting of Ni₇₅Al_xV_25-x alloys in the cyclic temperature field

Based on the microscopic phase-field kinetic model for ternary alloys, rafting of the microstructure of Ni₇₅Al_xV_25-x alloys in the cyclic temperature field and the diversification of the volume fraction with the temperature and composition change were investigated. The results show that the DO₂₂ phase is rafted obviously in the cyclic temperature field; the L1₂ phase is rafted obviously on the elastic soft direction when the Al content is higher. When the temperature of the cyclic temperature field is up to a certain value, the equilibrium volume fraction value of the L1₂ phase is higher than that in the constant temperature field; the equilibrium volume fraction value of the L1₂ phase increases slowly with the aging proceeding and the temperature of the cyclic temperature field increasing.