Abstract
The present study investigates the microstructure characteristics, tensile properties and work hardening behavior of friction stir welding (FSW) AA5083-AA6061 dissimilar aluminium alloys under different cooling conditions (naturally air-cooled and water-cooled). Microstructure evolution and tensile test of FSWed joints were investigated through Optical Microscope (OM), Electron Back Scattered Diffraction (EBSD), Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD) and Universal Testing Machine (UTM). EBSD results showed that the grain size obtained at the stir zone was 7.6 µm for air-cooled FSW (ACFSW) and grain growth restricted to 3.2 µm using water-cooled FSW (WCFSW). Brass [{110} <112>] and Goss [{110} <001>] were the two texture components that primarily evolved in FSW samples. The study suggests that joints produced with water cooling exhibited higher UTS at all distinct microstructure locations of the FSW joint and whereas the WCFSW-L sample exhibited higher UTS (271 MPa) than compared to ACFSW-L (246 MPa). Moreover, in the WCFSW, the strain hardening coefficient and work hardening rate enhanced by 6.3 % and 18.7 %, respectively, than ACFSW. The fracture surface morphology analysis of ACFSW and WCFSW samples was consistent with the tensile strength results.
Published Version
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