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Mechanical properties of graphite/aluminum metal matrix composite joints by friction stir spot welding |
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| Authors: | Chi-Sung Jeon Yong-Ha Jeong Sung-Tae Hong Md. Tariqul Hasan Huynh Ngoc Tien Seung-Hyun Hur Yong-Jai Kwon |
| Affiliation: | 1. Technical Research Center, Hyundai Steel Company, Dangjin, Korea 2. School of Mechanical Engineering, University of Ulsan, Ulsan, Korea 3. Institute of e-vehicle Technology, University of Ulsan, Ulsan, Korea 4. School of Chemical Engineering and Bioengineering, University of Ulsan, Ulsan, Korea 5. School of Materials Science and Engineering, University of Ulsan, Ulsan, Korea |
| Abstract: | Graphite/aluminum metal matrix composite (MMC) joints are successfully fabricated by friction stir spot welding (FSSW). During lap-joining processes of aluminum alloy sheets by FSSW, graphite/water colloid is applied between the tool shoulder and the upper plate. The Raman spectrum of the FSSW joint confirms that graphite/aluminum MMC is successfully induced in the stir zone. Quasi-static shear tests and micro hardness measurements of the FSSW joint also show that the strength and toughness of the joint are significantly improved by inducing graphite/aluminum MMC in the stir zone. The results of the present study suggest that the mechanical properties of structural components joined by spot welds can be easily enhanced by adopting MMC joints by FSSW, instead of changing the material or increasing the number of joints. |
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