采用磨损试验机、电子天平和扫描电镜对超声法制备的纳米Al_2O_3增强铝基复合材料磨损行为进行研究。结果表明:当纳米Al_2O_3添加量为1.5wt%时,该复合材料的硬度、耐磨性最好。随载荷增加,该复合材料磨损量增大,摩擦系数增大。在载荷为10、20 N时,复合材料磨损机制以磨粒磨损为主;当载荷增加到30 N时,出现以氧化磨损和粘着磨损为主的磨损机制;当载荷增加到40 N时,出现剧烈的粘着磨损。 The wear behavior of aluminum matrix composites reinforced with nano-Al_2O_3 prepared by ultrasonic method was studied by wear tester, electronic balance and scanning electron microscope. The results show that the hardness and wear resistance of the composites are the best when the nano-Al 2 O 3 content is 1.5wt%. With the increase of load, the wear amount of the composite increases and the friction coefficient increases. When the load is 10,20 N, the wear mechanism of the composite is abrasive wear. When the load increases to 30 N, the wear mechanism is mainly oxidation wear and adhesive wear. When the load increases to 40 N, Severe adhesive wear.