(中北大学 材料科学与工程学院，太原 030051)
摘 要: 采用三元微观相场动力学模型研究Ni74.6AlxMo25.4-x合金早期沉淀过程，对合金的微观组织演化图像、平均序参数和原子占位概率进行了分析。结果表明：合金首先析出L10和L12相，析出的L10相原位转变为L12相。随着Al浓度的增加，原子聚簇和有序化的进程加快。Ni原子倾向于占据αⅠ位和αⅡ位，Al原子和Mo原子倾向于占据β位。随着Al原子浓度的增加，Ni原子和Al原子在αⅠ和αⅡ位的占位概率增加，Mo原子在αⅠ和αⅡ位的占位概率降低，Al原子在β位占位概率增加，Ni原子和Mo原子在β位的占位概率降低。
关键字: Ni74.6AlxMo25.4-x合金；微观相场；L10相；占位概率
（College of Materials Science and Engineering, North University of China, Taiyuan 030051, China）
Abstract:The early precipitation process was investigated by the microscopic phase-field kinetic mode. The microscopic morphology evolution，average order parameters and atom occupation probabilities were analyzed. The results show that L10 and L12 phases precipitate form the Ni74.6AlxMo25.4-x alloy first and then L10 phase transforms into L12 phase in the following time. With increasing the aluminum concentration, the atom clustering and ordering process speeds up. Ni atom trends to occupy the αⅠ and αⅡ positions, Al and Mo atoms trend to occupy the β position. With increasing the aluminum concentration, the occupation probabilities of Ni and Al atoms in αⅠ and αⅡ positions increase, the occupation probabilities of Mo atom reduce, the occupation probability of Al atom in β position increases, the occupation probabilities of Ni and Mo atoms reduce.
Key words: Ni74.6AlxMo25.4-x alloy; microscopic phase-field; L10 phase; occupation probability
