Abstract:SiC and graphene nano-platelet (GNP) hybrid reinforced aluminum matrix (GNP/SiC/Al) composites were fabricated by high-energy ball milling combined with powder metallurgy process. The microstructure, mechanical properties, and wear performance of GNP/SiC/Al composites were characterized by SEM, TEM, universal tensile testing machines, and tribometers, with comparative analysis against gray cast iron (HT250). The results indicate that when SiC and GNP are uniformly dispersed in the matrix, the tensile strengths of composites are 287 and 101 MPa at room temperature and 350 ℃, respectively. During room temperature wear tests, the wear resistance of composites is lower than that of HT250. Both materials exhibit adhesive and abrasive wear mechanisms. Under high-temperature wear conditions, the wear resistance of the composites is better than that of HT250. HT250 exhibits adhesive and abrasive wear mechanisms, the composites are mainly characterized by adhesive wear. The exceptional high-temperature wear resistance of GNP/SiC/Al composites is attributed to three primary mechanisms: the high-temperature pinning effect of SiC and GNP; the self-lubricating properties of GNP; the formation of mechanically mixed layers during wear.