研究低能量激光喷丸对Ti-6Al-4V合金疲劳寿命的影响。采用残余应力分析、表面粗糙度测量、X射线衍射、光学显微镜、纳米压痕硬度测试、扫描电镜和透射电镜以及疲劳测试对激光喷丸样品进行表征。结果表明,激光喷丸处理导致在合金表面及近表面区域形成纳米晶,并伴随有硬度的增加及残余压应力的产生。由于纳米结构表面的形成及残余压应力的存在而带来的有利影响,与未喷丸处理合金相比,喷丸处理合金的疲劳寿命明显得到延长。 The effect of low energy laser shot peening on the fatigue life of Ti-6Al-4V alloy was studied. The laser shot peening samples were characterized by residual stress analysis, surface roughness measurement, X-ray diffraction, optical microscope, nanoindentation hardness test, scanning electron microscope and transmission electron microscopy and fatigue test. The results show that laser shot peening results in the formation of nanocrystallites on the alloy surface and in the near surface region with the increase of hardness and the residual compressive stress. Due to the formation of nanostructured surface and the existence of residual compressive stress, the fatigue life of shot peening alloy obviously prolongs compared with that of non-shot peening alloy.