利用超声振动辅助铸造法制备了 Al-Cr/Al原位复合材料，应用 XRD、SEM以及能谱分析(EDS)研究了复合材料的微观结构。通过 M-2000型磨损试验机研究了Al-Cr/Al原位自生复合材料的耐磨性能。结果表明，超声振动对原位增强体细化明显，随着 Cr含量的增加，原位增强体含量增加，增强体尺寸增大。不同类型的Al-Cr 金属间化合物在基体中同时生成，形成混合增强相；随着 Cr 粉末粒径增大，原位增强体尺寸具有最小值。随着Cr含量和粒径的增大，复合材料的磨损率呈先降低后升高的趋势。Cr 含量为8%，粒径为75μm 时，复合材料的磨损率最小，为0.294%，耐磨性能最好，相对纯铝耐磨性提高约8.5倍，磨损机制主要为磨粒磨损。
In-situ Al-Cr/Al composite was prepared by the ultrasonic vibration aided casting method in this pa-per.Microstructure was characterized by XRD,SEM and EDS.The wear resistance of composites was investi-gated by M-2000 wear tester.The results show that the ultrasonic vibration significantly refines the Al-Cr in-termetallic compound reinforcement.With the increase of Cr,the content and size of Al-Cr intermetallic com-pound reinforcement increase.The Al-Cr hybrid intermetallic compound reinforcement exists in the matrix at the same time.With increase of the Cr powder particle size,the wear resistance of in-situ Al-Cr/Al composite and in situ reinforcement size both have minimum value.When the content of Cr was 8%,the particle size was 75μm,the fine Al-Cr intermetallic compound reinforcement distributes in the composites evenly;meanwhile, the wear rate was minimum,which was 0.294%.The wear resistance of composites was 8.5 times that of pure aluminum.The wear mechanism was mainly abrasive wear.
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