The present work investigates the effect of aging on the microstructure, mechanical properties, and wear behaviour of the cast A356 alloy with Er and Zr addition. The aged A356-0.25Zr and A356-0.25Er alloys revealed some but not all of the eutectic and columnar structures. The microstructure of A356, A356-0.5Er, and A356-0.5Er-0.25Zr alloys exhibited large α-Al grains with discrete eutectic silicon. Various intermetallic types and morphologies were observed after the peak aging. The highest hardness (∼120 HV) and the highest tensile strength (∼215 MPa) were achieved in the A356-0.25Zr alloy under peak-aged conditions. The A356 alloy revealed the lowest weight loss and friction coefficient, though it had the least hardness. Delamination was the dominant wear mechanism in all alloys.
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