Characterization of hot extrusion deformation behavior, texture evolution, and mechanical properties of Mg–5Li–3Sn–2Al–1Zn magnesium alloy

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.