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The wear behavior of Al-Si alloys against a Carbon Fiber Reinforced Plastic was investigated under the lubricated condition. In an initial wear stage, primary Si particles were exposed from the aluminum matrix, and carbon fibers were exposed from the plastic matrix. Exposure of Si particles and carbon fibers was observed also in a mild wear stage. New hyper-eutectic aluminum alloy which doesn t contain coarser Si particles provides better wear resistance and less hostility to CFRP, compared to conventional Al-Si system alloys.

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Tool wear and wear mechanism of carbide cutting tool in turning Al-Si alloy diecastings were investigated. Decreasing amount of coarse primary silicon was effective for reducing cutting resistance and cutting tool wear. New hyper-eutectic Al-Si system alloy which doesn t contain coarser silicon particles provided good turning machinability equivalent to conventional eutectic Al-Si system alloy. In case of increasing feed rate from 0.05 to 0.10 mm/rev, cutting tool wear of conventional hyper-eutectic Al-Si system alloy increased. On the other hand, that of eutectic Al-Si system alloy decreased, and that of new hyper-eutectic Al-Si system alloy didn t changed. Builtup edge and aluminum deposit on the flank wear land were observed in all aluminum alloys.