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研究了Mg-Sn-Al-Zn-Si多元合金的设计原则及合金元素含量。结果表明:合理控制Al、Zn的含量能避免生成Mg_(17)Al_(12)及MgZn低温相,而生成Mg_(32)(Al,Zn)_(49)三元相。合金元素Si与基体Mg生成Mg_2Si高温相,Si的含量控制在1.2%以下(质量比,下同)较为适宜,加入量高于1.2%时易出现粗大Mg_2Si初晶相。主加元素Sn与基体Mg生成Mg_2Sn,含量为5%时合金铸态组织较佳,Sn的加入对改善Mg_2Si的形貌与分布有重要作用。
The design principles and alloying elements of Mg-Sn-Al-Zn-Si multi-element alloys were studied. The results show that reasonable control of the contents of Al and Zn can avoid the formation of Mg_ (32) (Al, Zn) _ (49) ternary phases due to the formation of Mg_ (17) Al_ (12) and MgZn low temperature phases. Alloying element Si and matrix Mg generate Mg_2Si high temperature phase, Si content is controlled below 1.2% (mass ratio, the same below) is more appropriate, when the addition amount is higher than 1.2% prone to coarse Mg_2Si primary phase. The main addition element Sn and matrix Mg generate Mg_2Sn, the content of which is 5%, the as-cast microstructure is better. The addition of Sn plays an important role in improving the morphology and distribution of Mg_2Si.