Relationship between welding conditions, abnormal grain growth and mechanical performance in friction-stir welded 6061-T6 aluminum alloy

In this work, a relationship between welding conditions, annealing behavior, and mechanical performance of friction-stir welded (FSWed) 6061-T6 aluminum alloy was examined. the entire studied FSW range, material found to be unstable against abnormal grain growth during post-weld solutionizing treatment. However, lowering heat input tended inhibit undesirable phenomenon. addition stir zone, microstructural coarsening also observed in heat-affected whereas thermo-mechanically affected zone experienced static recrystallization. all cases, result ~25-35°<110> rotation original crystallographic texture. Hence, process suggested governed by orientation-growth mechanism. Due relatively high strain-hardening ability intrinsic coarse-grained materials, grains suppressed tensile strain transverse tests thus degrading weld ductility.