Abstract
Microstructure and wear behavior of aluminum alloy AA7068/graphene nanoplate composites produced by ball milling, stir casting and ultrasonic waves have been investigated. The microstructural studies of the alloy revealed that graphene nanoplatelet addition reduces the grain size, but adding higher graphene nanoplatelet content (1 wt% graphene nanoplatelet) does not change the grain size considerably. T6 heat treatment was applied for all specimens before wear testing. Significant improvements in wear behavior were obtained with the addition of graphene nanoplatelet combined with T6 heat treatment. At higher graphene nanoplatelet contents, the presence of graphene agglomerate on grain boundaries was found to be the favored path for crack growth. The optimum amount of nanoparticles is 0.5 wt% graphene nanoplatelet. Dry sliding wear performance of the alloy was examined in normal atmospheric conditions. The experimental results showed that the T6 heat treatment considerably improved the resistance of 7068 aluminum alloy reinforced with 0.5 wt% graphene nanoplatelet to the dry sliding wear.
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