Role of Al₂O₃ fiber in eutectic Al-Si alloy composites

来源期刊：中国有色金属学报(英文版)2002年第5期

论文作者：翟秋亚 徐锦锋 Y. Iwai

文章页码：904 - 908

Key words：Al₂O₃ fiber; eutectic Al-Si alloy; composite; wear mechanism

Abstract: The effects of Al₂O₃ fiber on wear characteristics of eutectic Al-Si alloy composites were studied using a pin-on-disk tester under dry sliding condition. The results show that the Al₂O₃ fiber can make matrix grain be fine, specially the eutectic Si be finer and prevent the plastic flow of matrix and prohibit the crack propagation in the wear layer, thereby it can remarkably improve the mechanical property and the wear resistance of the MMCs. Since (Al₂O₃) fiber plays a role of certain framework in protecting the matrix against crash, it can eliminate the severe wear of MMCs with higher φ_f of fiber from the beginning of test. At mild stage, when φ_f is in the range of 8%~10%, the wear rates are the lowest. With increasing φ_f of Al₂O₃ fiber, the wear mechanism of MMCs can be transformed from adhesive delamination to brittle breakaway.