在基体合金AM50中分别加入Si和Ca, 研究了Si和Ca对AM50--xSi合金的微观组织、 力学性能及蠕变性能的影响. 结果表明: 加入Si后, 合金高温蠕变性能随Si量的增加而增加并超过了AS41的水平； 在AM50--$x$Si中加入微量Ca以后, 合金中的Mg$_{2}$Si相得到细化, 从汉字状转变成颗粒状, 室温及150℃拉伸性能明显提高.
AM50 magnesium alloy was adopted as master alloy, and 1\%, 2\% and 3\% Si additions were added, respectively. The influence of Si on the microstructure, mechanical and creep properties of AM50--$x$Si alloys was investigated. 0.3\% Ca was added to fine Mg$_{2}$Si. The results show that the addition of small amount of Ca to AM50--$x$Si alloys resulted in refinement of microstructure. Morphology of the Mg$_{2}$Si phases changed from coarse Chinese script shape to the fine polygonal shape. The mechanical properties of alloys at both ambient and elevated temperatures increased. The high temperature creep resistant properties of alloys increased with increasing Si content.
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