Mechanical and tribological analyses of Al6061-GO/CNT hybrid nanocomposites by combined vacuum-assisted and ultrasonicated stir casting method

Abstract Hybrid Al6061 metal matrix composites have been produced via the liquid metallurgical process (stir casting method) utilizing graphene oxide (GO) and multi-walled carbon nanotube (MWCNT) as reinforcement elements. By altering the weight percentages of both carbon nanotube and GO, which are 0.5–3 wt% at a regular interval of 0.5, respectively, the impact of the reinforcement materials’ weight percentage on the mechanical properties of the composites has been investigated. The tensile strength, hardness, and as-cast microstructure of the produced hybrid composites have all been examined. Al6061 + 1.5% GO + 1.5% MWCNT gives better mechanical properties compared to other samples. The scanning electron microscopy images reveal that there is a uniform distribution of reinforcements throughout the matrix. The findings reveal that the composite with 1.5 wt% GO and 1.5 wt% MWCNT (Sample S3) demonstrated the best balance of properties, with enhanced tensile strength, improved microhardness, and superior wear resistance due to uniform particle dispersion and strong interfacial bonding. The successful integration of GO and MWCNT in Al6061 highlights the potential of these nanocomposites for high-performance applications in the automotive and aerospace sectors, where a combination of lightweight, high strength, and durability is essential.