The effects of four different hot extrusion processes on the microstructure, texture, and mechanical properties of Mg–5Li–3Sn–2Al–1Zn alloys were investigated with the help of optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and electron backscatter diffraction (EBSD) techniques. The results show that the magnesium alloy experienced dynamic recrystallization during the hot extrusion processes, the grain size was significantly refined compared with that of the cast alloy, and the mechanical properties of the alloy were significantly improved. After the 105° forward-parallel channel extrusion process, the alloy exhibited optimal strength and plasticity with 178 MPa, 270 MPa, and 21.03% for tensile yield strength, ultimate tensile strength, and elongation, respectively, which were 61.8%, 44.4%, and 134.4% higher compared to the homogeneous state. The increase in strength is attributed to fine grain strengthening, while the significant increase in plasticity is due to the weakening of the basal texture and the improved coordination of plastic deformation of the magnesium alloy following grain refinement.

借助光学显微镜（OM）、扫描电子显微镜（SEM）、透射电子显微镜研究了四种不同热挤压工艺对Mg-5Li-3Sn-2Al-1Zn合金组织、织构和力学性能的影响。 (TEM) 和电子背散射衍射 (EBSD) 技术。结果表明，镁合金在热挤压过程中发生动态再结晶，晶粒尺寸较铸造合金显着细化，合金力学性能显着提高。经过105°正向平行通道挤压工艺后，合金表现出最佳强度和塑性，拉伸屈服强度、极限拉伸强度和延伸率分别为178 MPa、270 MPa和21.03%，分别为61.8%、44.4%、与均质状态相比，高出 134.4%。强度的增加归因于细晶强化，而塑性的显着增加是由于基础织构的减弱和晶粒细化后镁合金塑性变形的协调性提高。