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.
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