Abstract
Annealed 7B04 Al sheets in thickness of 2 mm were subjected to friction stir welding (FSW) un- der three rotation rate and welding speed parameters of 1600 r/min, 200 mm/min; 800 r/min, 200 mm/min and 400 r/min, 400 mm/min, respectively. The effect of welding parameters on the tensile property and microstructure of the FSW joints were investigated, with more efforts focusing on the low-temperature superplasticity of the nugget zones (NZs). The results showed that FSW joints with high quality could be produced by controlling welding pa- rameters, with a joint strength coefficient of 100% being obtained. Dynamic recrystallization took place in the NZs with fine and equiaxed grains generated. The grain size of the base material was about 300 μm, while it was signifi- cantly decreased in the NZs with decreasing the rotation rate: about 2, 1 and 0.6 μm for the above three samples, re- spectively. The fine grain structure of the NZs could facilitate their superplastic deformation. The NZs exhibited su-
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