Abstract
The present study appraises the effect of tool rotation direction during dissimilar double-sided friction stir welding of AA6061–AA7075 thick plates. The mechanical strength, fracture behavior and the microstructure evolution for the joints are studied. Sound joints without defect and higher strength was achieved for the joint wherein tool rotation in the second weld is provided in the reverse to that of the first weld. Electron backscatter diffraction of welded joints revealed finer grains at the weld center than observed below the tool shoulder affiliated to high degree of deformation/strain. Pole figures revealed the dominance of high shear texture B/B¯ and C components at the weld center. Orientation distribution function revealed the presence of strong intensity recrystallization texture components Cube {001}<100>, Goss {110}<001> and P {011}<112> at the weld center.
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