利用金相、电子显微镜、X射线衍射仪和X射线能谱仪研究了含Ca，Si镁合金的铸态组织特征。结果表明：含Si较低的合金由镁基体及CaMgSi相组成，而含Si较高的合金由镁基体及CaMgSi和Mg2Si两种相组成。 CaMgSi相呈三种不同的形态：离散块状、微细点状和针状，而本身是针状的Mg2Si则以“汉字形”团块的形态存在。根据Mg--Mg2Si--CaMgSi赝三元相图，详细讨论了铸态组织的形成机制。
The as--cast microstructure of Mg-based alloys containing Ca and Si was investigated using optical microscopy, XRD, SEM/EDS and TEM. It was found that the alloy containing low Si consisted of Mg-rich matrix and CaMgSi phase, while the alloy containing higher Si consisted of Mg2Si besides the Mg-rich matrix and CaMgSi. The phase CaMgSi existed in three different morphologies, namely discrete large angular, dispersive dot-like, and needle-like, while the Mg2Si, also needle-like, existed in the “Chinese-script” colonies. The formation mechanism of the as-cast microstructure was discussed in details based on a proposed pseudo-ternary Mg-Mg2Si-CaMgSi phase diagram.
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