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材料工程  2012 

Mg17Al12相在AZ61镁合金半连续铸锭中的分布特性

, PP. 13-17

Keywords: Mg17Al12,冷却速率,固相反扩散,微观偏析

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Abstract:

通过图像分析技术定量分析Mg17Al12相的大小和面积密度,并采用光学显微镜和扫描电镜观察Mg17Al12相在AZ61镁合金半连续铸锭的边部与心部形貌及分布上的差异。结果表明枝晶形态可以控制Mg17Al12相的大小和分布,枝晶越发达Mg17Al12相形态越细小分布越弥散。铸锭心部的Mg17Al12比边部的细小弥散并且主要分布于枝晶间而边部的Mg17Al12相主要群聚分布在晶界处,这与普通的永久模铸的结果相反。随着冷却速率增加,Mg17Al12相在共晶中所占比例增加,铸锭边部Mg17Al12相的面积密度比心部的高。另外固相反扩散对心部的Mg17Al12相的面积密度也有影响。

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