彭怡,张丹,颜宏伟,彭鹏,龙帅,张诚,杨青山,戴庆伟

• 1:重庆科技学院冶金与材料工程学院

摘要(Abstract)：

采用拉伸实验、扫描电镜、电子背散射衍射技术和粘塑性自洽(VPSC)模拟计算等方法分析了不同Mn含量对挤压Mg-1Al-xMn(x=1、2和3,mass%)合金微观组织和塑性变形机制的影响。结果表明：随着Mn含量从1 mass%增加至3 mass%,Mg-1Al挤压合金的强度和塑性得到同步提升，其中Mg-3Mn-1Al合金的力学性能表现良好，拉伸屈服强度、极限拉伸强度和断裂伸长率分别为302 MPa、325 MPa和21%。随着Mn含量的增加，Mg-1Al挤压合金中的第二相数量显著增加，且沿着挤压方向呈带状分布，Mg-3Mn-1Al合金的晶粒最细小，出现明显的混晶组织，平均晶粒尺寸为1.31μm。VPSC模拟结果表明，在Mg-1Al合金中加入Mn元素可以有效抑制基面滑移的启动，有利于促进锥面滑移系的激活，非基面滑移的启动能够有效协调应变，进而提升合金的塑性变形能力，最终实现强度和塑性的同步提升。

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