Aluminium (Al 413) based silicon carbide (SiC) and aluminium oxide (Al₂O₃) particle reinforced hybrid metal matrix composites were prepared by melt stirred squeeze casting technique. Equal weight fractions of SiC and Al₂O₃ particles were reinforced with Al 413 alloy by mechanical stirring and then the molten mixture was cast under pressure. Using equal weight fractions ensures balanced mechanical and tribological performance, combining the hardness of SiC with the thermal stability of Al₂O₃. Argon gas was used to prevent oxidation of molten aluminium and maintain clean melt conditions during stirring. The hardness of the composites increased proportionally with the reinforcement content due to the presence of hard ceramic particles that restricted plastic deformation. The tribological characteristics of these composites were tested utilising a pin on disc device under dry sliding circumstances. The dry sliding wear tests were conducted by varying key parameters—normal load, sliding velocity, and sliding time—to study their influence on wear rate and friction. The test results showed that the wear rate of composites decreased with an increase in reinforcement content. Wear rate and coefficient of friction of the composites increased with an increase in normal load and sliding velocity. Worn surface analysis was conducted to identify the wear mechanism of these composites. The worn surface analysis confirmed that hard ceramic reinforcements enhanced wear resistance. The dominant wear mechanisms observed were a combination of abrasion and delamination.

Keywords: Al 413 alloy, Hybrid metal matrix composites, Melt stirred squeeze casting, Dry sliding, Wear rate.