为研究激光喷丸对高强度变形镁合金ZK60疲劳性能的影响机理,使之适应交变应力结构件的工作需要,进行了激光喷丸强化表面改性和拉伸疲劳性能实验。实验结果表明,在激光喷丸强化区域获得有益的残余压应力,产生硬化效应,表面塑性变形的微小区域,变形轮廓曲线波动范围较基体小,增加喷丸次数可增强激光喷丸的强化效应。经3次激光喷丸后,中心孔疲劳试样的平均疲劳寿命由未喷丸试样的78023次提高到125641次,寿命增益达61%。从断口来看,激光喷丸强化主要是改变了裂纹源萌生位置,延缓了裂纹扩展速率,对瞬断区无明显影响。激光喷丸强化为镁合金的抗疲劳制造提供了新的途径。 In order to study the influence mechanism of laser shot peening on the fatigue properties of ZK60 high-strength deformation magnesium alloy and adapt it to the work requirements of alternating stress structure parts, experiments of laser shot peening surface modification and tensile fatigue properties were carried out. The experimental results show that in the laser shot peening area, beneficial residual compressive stress is obtained, and hardening effect is generated. The tiny area of ​​the surface plastic deformation and the fluctuation range of the deformation profile curve are smaller than the matrix. Increasing the number of shot peening can enhance the reinforcing effect of laser shot peening. After three laser shot peening, the average fatigue life of the central hole fatigue specimen increased from 78,023 shots without shot peening to 125,641 shots with a lifetime gain of 61%. From the fracture point of view, laser shot peening is mainly changed the source of crack initiation, slowed the rate of crack growth, instantaneous area no significant impact. Laser shot peening provides a new way for the fatigue resistance of magnesium alloys.