在新三思拉伸实验机CMT-5150上对挤压态Mg-3Al-0.8Sr进行室温压缩实验,研究不同应变量下的组织演变过程,并对压缩时的应力-应变曲线和断口形貌进行分析.结果表明:Sr的加入可以推迟孪生的发生,当应变量超过3.5％时,随着应变量的增加{101-2}拉伸孪晶的数量不断增加；挤压态Mg-3Al-0.8Sr室温压缩时的应力-应变曲线可分为4个阶段并分别对应不同的变形机制.在实验合金的断口形貌图中观察到大量的解理台阶和少量的韧窝,表明实验合金的断裂机制以脆断为主,塑性断裂为辅.
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