Exceptional dynamic compressive properties of bio-inspired three-dimensional interlocking graphene network reinforced copper matrix composites

Abstract

Insights into the reinforcement spatial architectures and their fundamental effects on the dynamic mechanical behaviors are of great importance for designing shock-resistant metallic structures. In this study, we report copper matrix composites (CMCs) reinforced by three-dimensional interlocking graphene network (3D-IGN) with a unique bio-inspired “brick-bridge-mortar” structure. Our results demonstrate that the 3D-IGN/Cu shows simultaneously enhanced dynamic strength and ductility as compared to the uniformly-distributed RGO/Cu and pure Cu at the specific strain rate from 1000 s−1 to 8000 s−1. The interlocking network structure not only blocks dislocation movement and restricts grain boundary sliding, but also alleviates the heat-induced softening by improving the thermal conductivity in the horizontal direction. The finite element simulation results further confirm the important role of the graphene network on strain delocalization. This work offers a promising bottom-up tactic to fabricate CMCs with network architecture and superior dynamic properties for high-rate applications.