Effect of extrusion process on grain structure, texture type and mechanical properties of 2195 Al-Li alloy wire rods

In this work, to investigate the effects of the hot extrusion process on the microstructure, grain structure, dynamic recrystallization(DRX), texture types, and mechanical properties of 2195 Al-Li alloy wire rods, the rods were fabricated with different hot extrusion temperatures (450 C-degrees, 480 C-degrees, 510 C-degrees) and speeds (0.2 mm/s, 0.6 mm/s, 1.0 mm/s). The microstructure of the 2195 Al-Li alloy wire rods in the extrusion direction (ED) and transverse direction (TD) was analyzed. The results show that in both the ED and the TD, as the extrusion temperature increases, the ratios of low-angle grain boundaries (LAGBs) gradually decrease, the degree of dynamic recovery (DRV) and DRX increases, and the proportion of equiaxed grains gradually increases. As the extrusion speed increases, the grain size, LAGBs, and the average misorientation angle (AMA) first decrease and then increase. The 2195 Al-Li alloy wire rod, which exhibits a texture comprising primarily of Brass {110} <112>, Cube {001} <100>, Goss {001} <100>, and Y {110} <111> components, has its strength and distribution of these texture components significantly influenced by the extrusion temperature. Excessively high extrusion temperatures will significantly increase the grain boundary migration speed and the formation of highangle grain boundaries (HAGBs), causing geometric recrystallization (GDRX) and discontinuous dynamic recrystallization (DDRX) to gradually transition into continuous dynamic recrystallization (CDRX). In addition, the relationship between the DRX, the texture, the mechanical properties and the extrusion process parameters has also been discussed in detail.