采用双场耦合条件下的宏观相场法,实现了模拟外加应力下无序基体中共格有序第二相的析出和粗化.结果发现,在外加应力下,第二相颗粒将发生定向粗化,形成筏状组织,成筏的方向取决于外加应力的性质、点阵错配的正负以及两相的弹性模量差.沉淀体积分数越大,颗粒合并和反相畴界对沉淀形貌的影响越显著,导致许多颗粒呈现不规则形貌.颗粒的对齐有两种机制,一是链条外颗粒的溶解,一是颗粒的迁移.在粗化过程中,多颗粒体系首先通过前1种机制形成链条,然后通过第2种机制使链条进一步对齐.
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