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The microstructural evolution around the tool during friction stir-welding of aluminum is described. The rotating tool induces a gradual rotation of the crystal lattice with a concomitant development of elongated subgrains. Additional small subgrains form within this structure by continuous dynamic recrystallization, gradually increasing in misorientation, eventually developing high-angle (>15°)...
The banding in a friction stir weld was determined to correspond to a periodic textural variation between the B/B¯ component and a mixture of B/B¯ and C components of the simple shear texture. These textures have similar deformation reference frames, indicating that the banding arises from a periodic variation in the strain magnitude or temperature during welding.
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