Texture Related Inhomogeneous Deformation and Fracture Localization in Friction-Stir-Welded Magnesium Alloys: A Review

Abstract

Friction stir welding (FSW) is a solid-state joining technique, which can avoid surface distortion and grain coarsening, and is very suitable for the joining of magnesium (Mg) alloys. However, a pronounced and inhomogeneous deformation texture was usually formed in the stir zone (SZ) of Mg welds. This has significant effect on the joint strength and fracture behavior of FSW Mg joints. In this review, microstructure and texture evolutions in weld zone (WZ) are analyzed based on the electron backscatter diffraction (EBSD) data. Schmid factor (SF) changes for slip and extension twinning were observed and discussed. The localized plastic deformation and fracture mechanisms of Mg welds are analyzed. In addition, some methods for improving the joint strength of FSW Mg welds are tested. Finally, the research direction of FSW Mg alloys in the future is determined.

Improving the tensile strength of non-keyhole friction stir lap welding joint of 2024-T4 Al alloy by radial basis function neural network and improved particle swarm optimization algorithm

“…As a representative of lightweight alloy, aluminum (Al) alloys are essential in the automotive, aerospace, and shipbuilding industries for their high specific strength and favorable formability (Naumov et al, 2019;Xie et al, 2022). Friction stir welding (FSW) is a solid-state welding technique which has been widely investigated to join light alloys due to its high weld quality, no pollution, and low energy consumption (Ren et al, 2020b). However, for the traditional FSW process, the rotating pin is withdrawn from the plate at the end of welding, thereby forming a keyhole.…”