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The microstructure, hardness and tribological properties of hot-pressed Al 7075 matrix composites containing the same SiC nanoparticles and different amounts of graphene were investigated. The results show that the Al-SiC-graphene composites exhibit higher hardness and wear resistance compared with Al-SiC composite and Al 7075 alloy.The friction coefficients decrease significantly with the increase of graphene content in the composites, whereas the limited impact on reducing friction is found on SiC nanoparticles. The dominant wear mechanism of Al-SiC-graphene composites transfers from abrasive wear to delamination wear with the increase of graphene content in the composites. It is believed that the hardness and wear-resistance improvements of the Al-SiC-graphene composites are attributed to the unique strengthening effect as well as the good lubricating efficiency of graphene, which demonstrates that graphene is an ideal filler for aluminum-matrix composites, acting as not only a favorable reinforcement but also an impactful lubricant.

Sliding-wear behavior of aluminum-matrix composites reinforced with graphene and SiC nanoparticles