Wear properties of cast Al-SiCp composites were characterized under dry wear condition. Wear tests were performed as function of test conditions including applied load, sliding speed and sliding distance employing a block-on-roller type wear test machine. Wear mechanism of Al-SiCp composites was investigated by means of the analyses for worn surfaces and wear debris. Results show that wear resistance of Al alloy is improved with reinforcement of SiCp especially with severer wear conditions such as high load and long distance. Weight loss of Al alloy and the composites increases almost linearly with applied load and sliding distance. There exist a transition speed at which a minimum wear rate encountered in terms of the sliding speed. Wear mechanism is fretting at the low speed, abrasive wear at t the transition speed and adhesive/abrasive wear at the high speed range. Uniform distribution of SiCp reinforcement is desirable for high wear resistance of Al-SiCp composites.
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