Abstract
The heat-treated AA6061-T6 plate was welded by friction stir butt-welding (FSW) using different rotation speeds. Electron backscattered diffraction (EBSD) results showed the occurrence of geometric dynamic re-crystallization within the stir zone (SZ), and existence of different shear texture components across the weld zone was revealed. It was found that the material flow was asymmetric around the tool in the stir zone. In addition, different rotation speeds also lead to different combinations of heat input and heterogeneous plastic deformation within the stir zone, which influences the mechanical behavior of the different welds during uniaxial tension and micro-hardness tests, due to the variations in the micro-structure.
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