从"结晶游离"的角度研究了Al、Zn元素对镁合金晶粒的细化机理,建立了一类可用于评估"游离晶"对合金组织细化能力的数学模型.分析结果表明,Mg-Al合金中的游离晶对合金组织的细化能力高于相同溶质浓度的Mg-Zn合金,并且溶质浓度越高,游离晶的细化能力差别越大,这可能是导致相同浓度的Mg-Al合金晶粒尺寸更加细小的主要原因.
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