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采用正交试验法优化了Al-5.0Cu-0.6Mn合金超声一挤压复合作用的工艺参数,利用扫描电镜(SEM),光学显微镜(OM)和定量金相分析等手段,研究了合金的微观组织和力学性能.结果表明,在挤压压力、超声功率、超声时间、浇注温度4个参数中,挤压压力对合金洛氏硬度的影响最大,贡献率达65.4％.其次是超声功率,贡献率为29.3％.在挤压压力为100MPa,超声功率为600W,超声时间为50 s及浇注温度为710℃的情况下,合金获得了最高的洛氏硬度和最理想的微观组织.“,”The processing parameters of ultrasonic vibration-squeeze cast Al-0.5Cu-0.6Mn alloy were optimized by orthogonal design.The microstructure and Rockwell hardness of the alloys were analyzed by optical microscope,scanning electron microscope and quantitative metallographic analysis.The results reveal that in four parameters,such as squeezing force,ultrasonic power,ultrasonic time and pouring temperature,squeezing pressure is the most important factor influencing the Rockwell hardness,and its contribution rate reaches 65.4 ％.Ultrasonic power is the second factors,which contributes 29.3 ％.The highest Rockwell hardness and desirable microstructures of the alloy can be obtained at pouring temperature of 710 ℃,squeezing pressure of 100 MPa,ultrasonic vibration power of 600 W for 50 s.