Synergistic effect of Al 2 O 3 -decorated reduced graphene oxide on microstructure and mechanical properties of 6061 aluminium alloy

In this study, Al6061 alloy matrix composites reinforced Al O -decorated reduced graphene oxide (Al O /RGO) with 0.1, 0.3 and 0.5 weight present (wt%) were successfully fabricated using high energy ball milling and hot extrusion techniques. The microstructures of these Al O /RGO/Al6061 aluminum matrix composites (Al MMCs) were characterized. The results showed that Al O /RGO were uniformly distributed within the Al6061 matrix and tightly bonded to the matrix. Al O encapsulation on RGO surface would prevent the formation of Al C brittle phase in matrix, ensuring that there was no reaction between the reinforcement and the matrix Al6061. Tensile strength and Vickers hardness tests demonstrated that the mechanical properties of Al MMCs significantly increased with addition of Al O /RGOs. Remarkably, Al MMCs with 0.1 wt% reinforcement showed tensile yield and tensile strengths of 270 MPa and 286 MPa, respectively, which were 49% and 43% higher than those of pure Al6061 prepared using the same process. Furthermore, the 0.1 wt% Al O /RGO composite also showed the best plastic deformation capability in considering of the strength.