Abstract An ultra-high strength Mg-3Al-Zn alloy with low tension-compression yield asymmetry was successfully fabricated through adding 0.2 wt% MgO. The as-extruded alloy exhibits a tensile yield stress of 459 MPa, an ultimate tensile strength of 519 MPa, an elongation to failure of 3.2%, and a low tension-compression yield asymmetry of 1.01. The combined effect of partially nanocrystallized structure, nanoscale and coherent MgO precipitates, and ultra-fine recrystallized Mg grains results in the ultra-high strength and further results in the low tension-compression yield asymmetry with additional effect of weak basal texture.

中文翻译：

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一种具有低拉压屈服不对称性的超高强度Mg-3Al-Zn合金

摘要 通过添加0.2 wt% MgO成功制备了具有低拉压屈服不对称性的超高强度Mg-3Al-Zn合金。挤压态合金的拉伸屈服应力为 459 MPa，极限拉伸强度为 519 MPa，断裂伸长率为 3.2%，拉伸-压缩屈服不对称性为 1.01。部分纳米晶结构、纳米级和连贯的 MgO 析出物以及超细再结晶的 Mg 晶粒的综合作用导致超高强度，并进一步导致低拉伸 - 压缩屈服不对称以及弱基底织构的附加效应。