Hyper-eutectic aluminum-silicon alloys are surface treated with nitrogen and carbon by ion implantation means so as to form hard, wear resistant particles of silicon nitride and silicon carbide which are surrounded by a hard matrix of aluminum nitride and aluminum carbide, depending on the species implanted. During applications where wear resistance is required, the hard silicon-based particles provide the wear resistant phase, thereby shielding the surrounding aluminum-based matrix. Yet the modified aluminum-based matrix is also sufficiently hard so as to provide strength and support for the silicon-based particles. Substantial improvements in wear resistance are obtained for these hyper-eutectic aluminum-silicon alloys, as compared to conventional alloys which have not been treated in accordance with this invention.
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