▎ 摘　　要

Graphene nanoplatelets (GNPs) reinforced 2024Al alloy was successfully fabricated by ultrasonic vibration dispersion. The microstructure and mechanical properties of the 2024Al-GNPs composites with various GNPs concentrations (0.5-1.1 wt%) were analyzed. The strengthening mechanism and the interface bonding between the GNPs and Al matrix were investigated. When the content of added GNPs was 0.8 wt%, the tensile strength, yield strength and microhardness of the composites reached 236 MPa, 184.4 MPa and 122.4 HV, respectively, corresponding to enhancements by 30%, 43.3% and 31.6% compared to those of the matrix. The interface was clean under the ultrasonic vibration, and brittle Al4C3 phase was not formed on the interface. The good interface bonding and the improvement of GNPs dispersion enabled GNPs to provide effective strengthening for the composites.