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Pohang, South Korea

Choi D.-H.,Sungkyunkwan University | Ahn B.-W.,Sungkyunkwan University | Lee C.-Y.,Automotive Applications Research Team | Yeon Y.-M.,Suwon Science College 9 10 | And 2 more authors.
Intermetallics | Year: 2011

The spot welding of Al plate to Mg plate was produced by friction stir spot welding using various tool rotation speed and duration time of the tool to investigate the effects of the welding parameters on the reaction of Al and Mg alloy. The interface microstructure and phase were investigated using optical microscopy, scanning electron microscopy and X-ray diffraction. The mechanical properties of the joints are evaluated using tensile test. Experimental results show that intermetallic compounds were formed in the interface of the Al and Mg alloys. The thickness of intermetallic compounds layer increases with increasing tool rotation speed and duration time, and has a significant effect on the strengths of the joints. Heavy thickness of intermetallic compounds layer seriously deteriorates the mechanical properties of the joints. The intermetallic compounds layer mainly contains Al3Mg2 and Al12Mg17© 2010 Elsevier Ltd. All rights reserved. Source

Choi D.-H.,Sungkyunkwan University | Lee C.-Y.,Korea Advanced Institute of Science and Technology | Ahn B.-W.,Sungkyunkwan University | Choi J.-H.,Sungkyunkwan University | And 6 more authors.
Journal of Materials Science and Technology | Year: 2011

A high-carbon steel joint, SK5 (0.84 wt% C), was successfully welded by friction stir welding (FSW), both without and with a gas torch, in order to control the cooling rate during welding. After welding, the weld zone comprised gray and black regions, corresponding to microstructural variation: a martensite structure and a duplex structure of ferrite and cementite, respectively The volume fraction of the martensite structure and the Vickers hardness in the welds were decreased with the using of the gas torch, which was related with the lower cooling rate. © 2011 The Chinese Society for Metals. Source

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