通过相场模型模拟纳米尺度晶粒生长演变过程,寻求导致晶粒异常长大的影响因素,探讨获得在纳米多晶结构AZ31镁合金中产生少量分散的大晶粒的理想混晶显微组织形成的可能性.模拟结果显示,有三个因素可以控制纳米结构中的晶粒异常长大:储存能、界面能和界面能动性.如果局域应变储能低于基体储能的1.60倍,或局域界面能高于基体的0.76倍,或局域界面能动性低于基体的3倍,则没有异常长大的晶粒出现.模拟得出,适当引入少数特定的初始纳米晶粒,可以实现预想的理想混晶组织.
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