Comprehensive performance regulation of Cu matrix composites with graphene nanoplatelets in situ encapsulated Al2O3 nanoparticles as reinforcement.

Due to the poor compatibility between the reinforcement and Cu matrix, interfacial bonding is of vital importance for the comprehensive properties of graphene nanoplatelets (GNPs)/Cu matrix composites. Herein, we reported a novel hybrid reinforcement with pea-pod structure (surface protruding structure of GNPs) prepared via in situ synthesis, which contributed to the dramatically ameliorated interfacial structure of the composites and regulated the quasi-stability deformation process. The Cu@GNPs@Al 2 O 3 /Cu composite exhibited optimal strength (YS: 290 MPa-0.45 vol% Al 2 O 3 , 300 MPa-0.76 vol% Al 2 O 3), moderate ductility (18%), as well as far exceeding the toughness of the GNPs/Cu composites. Concurrently, the electrical conductivity of the composite remains at a high level of 96.5 IACS%. The present findings may provide a feasible strategy to optimize interfacial structure by adjusting the structure of reinforcement, which enables improved comprehensive properties of the Cu matrix. [Display omitted] • Hybrid reinforcement with pea-pod structure was prepared via in situ synthesis. • Surface protrusion of GNPs ameliorates interfacial structure of the composites. • Cu composites have better mechanical properties and electrical conductivity. [ABSTRACT FROM AUTHOR]