Effects of the types of overlap on the mechanical properties of FSSW welded AZ series magnesium alloy joints |
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Authors: | Dan Wang Jun Shen Lin-zhi Wang |
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Affiliation: | 1.School of Materials Science and Engineering,Chongqing University,Chongqing,China |
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Abstract: | The effects of the types of overlap on the mechanical properties of the friction stir spot welding (FSSW) welded AZ series
magnesium alloy joints were investigated by microstructural observations, microhardness tests, and tensile tests. The results
show that the microstructure of the stir zone adjacent to the periphery of the rotating pin is mainly composed of the upper
sheet. The average distance D between the longitudinal segment of the curved interface and the keyhole periphery, the tensile shear force, and the microhardness
of the stir zone of the FSSW welded AZ61 alloy joint are the highest in all samples. During FSSW of AZ31 and AZ61 dissimilar
magnesium alloys, the irregular deformation of the longitudinal segment of the curved interface appears, while the microhardness
of the stir zone is higher when AZ61 alloy is the upper sheet. Moreover, the microhardness of the stir zone increases initially
and then decreases sharply in the longitudinal test position. |
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