研究了7种亚快速凝固Mg-Zn-Sn-Al-Ca合金的组织、拉伸性能和抗蠕变性能.对于Mg-Zn-ySn-2Al-0.2Ca (x+y=9,x/y为2,1和0.5)合金,锌锡比为1时室温抗拉强度和屈服强度最高;150℃屈服强度随着锌锡比的增加而提高,而200℃相反.这可能与低锌锡比合金中Mg2Sn较多、含Zn化合物较少且Mg2Sn具有高温强化作用有关.对于Mg-4.5Zn-4.5Sn-2Al-zCa (z=0,0.2,0.4,0.6)合金,室温和200℃抗拉强度和屈服强度随着Ca含量的增加先提高后下降,峰值分别出现在0.2％ Ca和0.4％ Ca.200℃/50MPa压缩蠕变时,合金初始应变量和稳态蠕变速率随着Ca含量的增加而降低.少量Ca可以提高Mg-4.5Zn-4.5Sn-2Al合金的室温和高温强度并改善抗蠕变性能,但降低高温塑性.此外,也影响拉伸断裂模式.随着Ca含量的增加,合金室温断裂由解理断裂转变为准解理断裂,200℃断裂由韧性断裂转变为准解理断裂.
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