Local Microstructure and Texture Development during Friction Stir Spot of 5182 Aluminum Alloy

The local microstructure, texture gradient and mechanical properties through the shoulder dimension (10 mm) of upper lower AA5182 aluminum sheets were investigated using electron backscatter diffraction (EBSD) Vickers microhardness after friction stir spot welding (FSSW). Based on microstructural features (mean grain size, boundary type dynamic recrystallization (DRX)), sheet was found to be mainly composed zone (SZ) thermomechanically affected (TMAZ) due high deformation induced simultaneously by tool rotation download force, while SZ, TMAZ, heat-affected (HAZ) base metal (BM) detected in limited effect sheet. changes, nature deformation, demonstrated a shear-type at SZ plane strain compression TMAZ then HAZ BM. gradually decreased with increasing distance from keyhole along regions. Eventually, microstructure evolutions correlated based Hall–Petch relationship.