The microstructure evolution and deformation mechanism of the as-extruded-annealed Mg-4Li-1Al-0.5Y alloy (denoted as LAY410) were investigated during the hot tensile deformation at the temperatures between 150°C and 300°C with strains from 8 × 10⁻⁵ s⁻¹ to 1.6 × 10⁻³ s⁻¹. The results show that when the strain rate decreases and/or the deformation temperature increases, the peak stress of the alloy gradually decreases, and the elongations to fracture gradually increases. The true stress–strain curves show typical dynamic recrystallization (DRX) softening characteristics. It is observed that the microstructure in the magnesium (Mg) alloy deformed at 150°C is mainly composed of the deformed grains and a few recrystallized grains. The microstructures in the Mg alloy deformed at 200°C consisted of substructures and a slightly increasing number of dynamic recrystallized grains. When the deformation temperature reaches 250°C, the number of recrystallized grains increases significantly, and the microstructures are dominated by recrystallized grains. Moreover, through theoretical calculation and result analysis, the activation energy was about 99.3 kJ/mol, and the hot tensile deformation mechanism was the alternate coordinated deformation mechanism among grain boundary slip (GBS), intragranular slip, and DRX.

研究了挤压退火态 Mg-4Li-1Al-0.5Y 合金（表示为 LAY410）在 150°C 至 300°C 温度下的热拉伸变形过程中的组织演变和变形机制，应变为 8 × 10 ^-5 s ^-1至 1.6 × 10 ^-3 s ^-1. 结果表明，当应变速率降低和/或变形温度升高时，合金的峰值应力逐渐减小，断裂伸长率逐渐增大。真实的应力-应变曲线显示了典型的动态再结晶 (DRX) 软化特性。观察到在 150°C 变形的镁 (Mg) 合金的显微组织主要由变形晶粒和少量再结晶晶粒组成。在 200°C 变形的镁合金的显微组织由亚结构和数量略有增加的动态再结晶晶粒组成。当变形温度达到250℃时，再结晶晶粒数量显着增加，组织以再结晶晶粒为主。此外，通过理论计算和结果分析，