Effect of heat treatment on the interface and property enhancement of reduced graphene oxide/2024Al matrix composites

The interface mismatch and weak bonding between the aluminum matrix and reduced graphite oxide (rGO) limits the reinforcing effect of reduced graphene oxide-reinforced aluminum matrix composites. This study utilized vacuum hot-pressing sintering and hot extrusion methods to fabricate rGO/2024Al composite materials and improved the interface bonding of the composite materials through solution treatment and aging. The research results indicate that the tensile strength of the heat-treated composite material increased to 455 MPa, representing a 19% improvement. Appropriate heat treatment processes can aid in enhancing the interfacial structure of composites, augmenting the interfacial bonding strength, and optimizing load transfer efficiency. The reinforcement mechanisms of composites typically include textured strengthening, fine-grained strengthening, and load transfer strengthening. In addition, the rGO can toughen the composites through crack deflection and bridging effects. Therefore, this technique offers a promising route for optimizing properties and improving the interface of aluminum matrix composites reinforced with graphene, via a heat treatment process.