(中北大學(xué) 材料科學(xué)與工程學(xué)院，太原 030051)
摘 要: 采用三元微觀相場動(dòng)力學(xué)模型研究Ni74.6AlxMo25.4-x合金早期沉淀過程，對合金的微觀組織演化圖像、平均序參數(shù)和原子占位概率進(jìn)行了分析。結(jié)果表明：合金首先析出L10和L12相，析出的L10相原位轉(zhuǎn)變?yōu)長12相。隨著Al濃度的增加，原子聚簇和有序化的進(jìn)程加快。Ni原子傾向于占據(jù)αⅠ位和αⅡ位，Al原子和Mo原子傾向于占據(jù)β位。隨著Al原子濃度的增加，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。
關(guān)鍵字: Ni74.6AlxMo25.4-x合金；微觀相場；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
