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The wear behavior of hyper-eutectic Al-Si alloys against bearing steels was investigated under the lubricated condition. The severe-mild wear transition of hyper-eutectic Al-Si alloys occurred when Si-particle size or area ratio exceeded critical values. Below the critical value, Al-Si alloys still remained in the sever wear mode resulting in a large amount of wear due to the insufficient sparse distribution of primary Si phase at the contact area.

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