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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。
The precipitation process of Ni74.6AlxMo25.4-x alloy was studied by using the three-dimensional micro-phase field dynamics model. The microstructure evolution images, average order parameters and atomic occupancy probability of the alloy were analyzed. The results show that the alloy precipitates L10 and L12 first, and the precipitated L10 phase changes into L12 phase in situ. As the concentration of Al increases, the process of atom clustering and ordering accelerates. The Ni atoms tend to occupy the α I and α II positions, and the Al and Mo atoms tend to occupy the β position. With the increase of Al atom concentration, the probability of occupancy of Ni atom and Al atom in αⅠand αⅡpositions increases, the probability of occupancy of Mo atom in αⅠand αⅡpositions decreases, while that of Al atoms increases in β position, The probability of occupying the Mo atom in the beta position decreases.