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中文摘要：
Mg2Si相的变质和细化被认为是改善含Si镁合金力学性能的关键因素之一。研究了Sr和Sb变质AZ61-0．7Si镁合金的铸态组织和力学性能。研究结果表明：添加0．4％（质量分数）Sb对AZ61—0．7Si镁合金中的汉字状Mg2Si相有一定细化作用，但没有明显变质效果。相反，添加微量Sr对AZ61—0．7Si合金中的汉字状Mg2Si相有明显变质和细化作用。在AZ61—0．7Si合金中添加0．03％～0．09％Sr（质量分数）后，合金中的Mg2Si相从粗大汉字状形貌变为细小的颗粒状和／或多边形状。相应地，合金的抗拉性能和蠕变性能得到显著提高。
英文摘要：
The modification and refinement of Mg2Si phase is thought as one of the key aspects to improve the mechanical properties of Si-containing magnesium alloys. The paper investigates the as-cast microstructure and mechanical properties of Sr and Sb modified AZ61-0.7Si magnesium alloy. The results indicate that adding 0.4wt%Sb can result in the relative refinement of Chinese-script-shaped Mg2Si phases in the AZ61-0.7Si alloy, but the modification is not obvious. However, adding small amounts of Sr can obviously modify and refine the Chinese-script-shaped Mg2Si phases in the alloy. After added 0.03wt%-0.09wt% Sr, the morphology of the Mg2Si phases in the alloy changes from the coarse Chinese script shape to fine granule and/or irregular polygonal shapes. Accordingly, the tensile and creep properties of the alloy are greatly improved.
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