对铝-铜-镁合金试样进行复合喷丸处理，通过观察喷丸处理后试样的表面形貌和测量试样的表面粗糙度、残余应力、衍射峰半峰宽及显微硬度等参数，分析了复合喷丸处理对铝-铜-镁合金表面形貌和力学性能的影响。结果表明：铝-铜-镁合金试样经复合喷丸处理后表面粗糙度变化不大，由0.70 mm增加到2.97 mm，试样表面整体细密、均匀，完整性较高，表面质量较好；引入较深的残余压应力场，最大残余压应力为306 MPa，且压应力场整体分布均匀，能够起到很好的强化效果；表面衍射半峰宽增大，为0.275°；表面显微硬度增大，为180.8 HV，比基体的硬度120 HV增加了50%。

The Al-Cu-Mg alloy sample was treated by composite shot peening. The effects of composite shot peening on the surface morphology and mechanical properties of Al-Cu-Mg alloy were analyzed by observing the surface morphology of sample after shot peening and measuring the surface roughness, residual stress, half maximum width of diffraction peak and microhardness of sample. The results show that the surface roughness of Al-Cu-Mg alloy sample increases little from 0. 7 mm to 2. 97 mm after composite shot peening, the surface of sample is fine and uniform, and has high integrity and good surface quality. The deep residual pressure stress field is introduced, the maximum residual pressure stress is 306 MPa, and the overall distribution of the stress field is uniform, which can play a good strengthening effect. The half peak width of surface diffraction increases to 0. 275°. The surface microhardness increases to 180. 8 HV, which is 50% higher than matrix of 120 HV.