考察了过热处理对 Al- Si过共晶合金磨损性能的影响 .结果表明 ,过热处理可以改善材料的耐磨性 ,尤其是高载荷下的耐磨性 ;并且过热处理温度越高 ,材料的耐磨性越好 .其原因在于组织中的初生硅粒子受接触应力的作用时 ,易破碎而形成裂纹和孔洞 ,从而降低材料的磨损性能 .组织中的初生硅越细小且分布越弥散 ,基体的强度越高 ,材料的耐磨性越好 The effects of overheating on the wear properties of Al-Si hypereutectic alloys were investigated. The results show that the overheating treatment can improve the wear resistance of the Al-Si hypereutectic alloy, especially under high load. The higher the overheating temperature, The reason is that when the primary silicon particles in the structure are exposed to the contact stress, the silicon particles are easily broken to form cracks and holes, thereby reducing the wear performance of the material. The smaller and more dispersed primary silicon particles in the structure, The higher the strength, the better the wear resistance of the material