Abstract The Mg-Zn-Y-Mn alloy containing LPSO phase is a new type of high-strength Mg alloy system, and research on its hot deformation behavior has not been carried out. The hot compression experiments (compression deformation amount is 70%) of the as-homogenized Mg95.21Zn1.44Y2.86Mn0.49 alloy were performed at a temperature range of 250–500 °C and a strain rate range of 0.001–5 s−1 on a Gleeble-1500D thermo-mechanical simulator, and the flow behavior and microstructure evolution of the alloy during the deformation process were studied. According to the established constitutive equation, the stress index of the test alloy during hot compression deformation was 16.17, and the activation energy Q of hot deformation was 393.32 kJ/mol. The microstructure after deformation showed that incomplete dynamic recrystallization (DRX) began to occur at 350 °C, and complete DRX occurred at 450 °C, forming equiaxed fine recrystallized grains. Due to the presence of the LPSO phase, the activation energy Q of the experimental alloy was higher than the conventional Mg alloys.

中文翻译：

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含LPSO相Mg95.21Zn1.44Y2.86Mn0.49合金的热变形行为

摘要 含LPSO相的Mg-Zn-Y-Mn合金是一种新型的高强度镁合金体系，对其热变形行为的研究尚未开展。均质化 Mg95.21Zn1.44Y2.86Mn0.49 合金的热压缩实验（压缩变形量为 70%）在 250-500°C 的温度范围和 0.001-5 s-的应变速率范围内进行1 在 Gleeble-1500D 热机械模拟器上，研究了合金在变形过程中的流动行为和微观结构演变。根据建立的本构方程，试验合金在热压缩变形过程中的应力指数为16.17，热变形活化能Q为393.32 kJ/mol。变形后的显微组织表明不完全动态再结晶（DRX）在 350°C 开始发生，并且在 450°C 发生完全 DRX，形成等轴细小再结晶晶粒。由于 LPSO 相的存在，实验合金的活化能 Q 高于常规镁合金。