Effect of post-heat treatment on the fatigue behaviour of a friction stir spot-welded Al–Mg–Si alloy
作者： Yoshihiko Uematsu , Keiro Tokaji , Yasunari Tozaki , Tatsuo Kurita , Shunsuke Murata
DOI: 10.1080/09507110802542981
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摘要: In this paper, the effect of post heat treatment on fatigue behaviour friction stir spot welded Al–Mg–Si aluminium alloy was investigated. The microstructure weld zone classified into two regions: (SZ) and mixed (MZ), where fine equiaxed grains due to dynamic recrystallization were observed. Two kinds treatment, namely aging T6 applied as-welded joints. in SZ MZ extremely enlarged only by but some still remained near boundary MZ. Fatigue tests conducted using lap-shear specimens at a stress ratio R = 0.1. Post treatments exhibited little influence strength, fracture morphology dependent both load level treatment. At high loads, took place through aged joints, while along treated joint. low crack initiated edge o...
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