通过光学显微镜、扫描电镜观察和拉伸、压缩试验研究了在不同温度下Mg-11Y-5Gd2Zn-0.5Zr(WGZ115)镁合金的拉压不对称性及其原因.结果表明:该合金在低于200℃拉伸时发生脆断,在200～300℃内拉伸屈服强度大于压缩屈服强度,在300℃时拉伸屈服强度与压缩屈服强度相等,在高于300℃后拉伸屈服强度小于压缩屈服强度;相同温度下该合金抗压强度大于抗拉强度,压缩的最大应变量大于拉伸的最大应变量;在拉伸时,合金裂纹多为穿晶扩展,二次裂纹导致合金在25～200℃迅速脆断;在压缩时,合金内部出现孪晶带,使其压缩变形能力增强.
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