Microstructural Evolution in Friction Stir Welded 1050 Aluminum and 6061 Aluminum Alloy

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The microstructure of friction stir welded 1050 aluminum and 6061 aluminum alloy was observed by a metallographic technique, transmission electron microscopy, electron backscatter diffraction pattern and optical microscopy. In the stir weld zone, the microstructure of welded 1050 aluminum was significantly different from that of the welded 6061 aluminum alloy. In the case of welding 1050 aluminum, there was a comparatively uniform microstructure in the stir weld zone, not a wedge-shaped microstructure formed in a stir welded 6061 aluminum alloy. EBSD indicated that there was almost same fraction of low angle boundaries among the thermo mechanically affected zone in welded 1050 aluminum and 6061 aluminum alloy. In the stir weld zone, equiaxed grains were created and the grain size of 1050 aluminum was little larger than that of 6061 aluminum alloy, suggesting that precipitates pinning effect affects the dynamic recrystallization in the stir weld zone.

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