Mechanical properties of graphite/aluminum metal matrix composite joints by friction stir spot welding

다국어 초록 (Multilingual Abstract)

Graphite/aluminum metal matrix composite (MMC) joints are successfully fabricated by friction stir spot welding (FSSW). Duringlap-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-staticshear tests and micro hardness measurements of the FSSW joint also show that the strength and toughness of the joint are significantlyimproved by inducing graphite/aluminum MMC in the stir zone. The results of the present study suggest that the mechanical propertiesof structural components joined by spot welds can be easily enhanced by adopting MMC joints by FSSW, instead of changing the materialor increasing the number of joints.

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