This research evaluated the impact of tin addition on the particle-matrix interface, wear properties, and hardness of A356 aluminum alloy reinforced with Al2O3 and ZrO2 particles. Initially, 0.5 wt% Sn was added to the A356 alloy using a semi-solid stirring casting method. Subsequently, a weighed amount of Al2O3 and ZrO2 particles was added to the molten alloy while rotating at 600 rpm. After 10 minutes, the melt was cast into a graphite mold. Microstructural analysis was conducted using a scanning electron microscope. The results showed that tin was rejected to the particle-matrix interface region during cooling, which resulted in better interface bonding. Pin-on-disk tests showed that the composite’s wear resistance increased, and the friction coefficient decreased with the addition of Sn. The wear mechanism changed from adhesive to adhesive-abrasive, which was in good agreement with the increase in hardness of the composite according to Archard’s relation.
