Abstract:SiC and graphene nano-platelet (GNP) hybrid reinforced aluminum matrix (GNP/SiC/Al) composites were fabricated via high-energy ball milling combined with powder metallurgy. The microstructure, mechanical properties, and wear performance of the composites were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), universal tensile testing machines, and tribometers, with comparative analysis against gray cast iron (HT250). Results indicate uniform dispersion of SiC and GNP within the matrix. The composites exhibited the tensile strengths of 287 MPa and 101 MPa at room-temperature and 350°C, respectively. During room-temperature wear tests, the composites demonstrated inferior wear resistance to HT250, with both materials exhibiting adhesive and abrasive wear mechanisms. Under high-temperature wear conditions, the composites showed significantly superior wear resistance to HT250. While HT250 exhibited adhesive and abrasive wear mechanisms, the composites primarily underwent adhesive wear. The exceptional high-temperature wear resistance of GNP/SiC/Al composites is attributed to three primary mechanisms: (1) the high-temperature pinning effect of SiC and GNP, (2) the self-lubricating properties of GNP, and (3) the formation of mechanically mixed layers during wear.