Microstructure and mechanical properties of two Al alloys welded by linear friction weld

Abstract Two high strength Al alloys AA2050 and AA7010 have been joined using linear friction welding (LFW) in this study. Microstructural evolution across the weld line developed during linear friction welding has been examined. Their effects on mechanical properties have also been evaluated. A clean weld region where there is free of microcracking, microporosity, and oxides, was obtained. Dynamic recrystallization (nearly full and partial) took place on the weldment. Dissolution of ‘parent’ precipitates in centre weld zone (CWZ) and thermomechanical affected zone (TMAZ) was observed, thus leading to lower hardness and strength compared with the parent materials.