The effects of Al 2O 3 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 Al 2O 3 fiber can make matrix grai...The effects of Al 2O 3 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 Al 2O 3 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 Al 2O 3 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 Al 2O 3 fiber, the wear mechanism of MMCs can be transformed from adhesive delamination to brittle breakaway.展开更多
文摘The effects of Al 2O 3 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 Al 2O 3 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 Al 2O 3 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 Al 2O 3 fiber, the wear mechanism of MMCs can be transformed from adhesive delamination to brittle breakaway.
