▎ 摘　　要

Graphene and SiC nanoparticles hybrid reinforced aluminum matrix composites were prepared by ball milling and hot press sintering. The effect of graphene content on microstructure and wear properties of composites was investigated. The results show that increasing the graphene content is beneficial to maintain the structural integrity of graphene during ball milling and hot pressing sintering, and to reduce the stress concentration of SiC nanoparticles on the matrix. The wear resistance of the composite is improved with the increase of graphene content. As the graphene content increases, the wear mechanism changes from abrasive wear to delamination wear. Through the analysis of the cross-sectional morphology of the wear marks, it is found that the improvement of the wear resistance is based on the formation of a graphene-rich dry lubricating layer on the worn surface, which explains the formation mechanism of the graphene dry lubricating layer in the composite.