Journal
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
Volume 19, Issue 3, Pages 231-235Publisher
SPRINGER
DOI: 10.1007/s12613-012-0543-0
Keywords
magnesium alloys; friction stir welding; microstructure; microhardness; tensile properties
Categories
Funding
- Key Scientific and Technological Project of Chongqing, China [2009AC4046]
- Natural Science Foundation of Chongqing Science & Technology Commission, China [2010BB4039]
- Fundamental Research Funds for the Central Universities of China [CDJZR11135501, CDJXS10131155]
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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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