中文摘要：

利用激光冲击强化技术对TC11钛合金进行处理,通过电子透射显微镜、残余应力测试仪和显微硬度计分别分析了TC11钛合金激光冲击前后微观组织、残余应力和显微硬度的影响。实验结果表明：表面微观组织在不同冲击次数下呈现出位错密度-位错胞-纳米晶的细化过程,且纳米晶随着冲击次数增加而变得更加细小、均匀;材料表面产生了-540 MPa以上的残余压应力,且显微硬度也得到显著提高,幅度达到20%左右,不同次数下硬度影响深度由600μm增至1200μm。

英文摘要：

TC11 titanium alloy was treated by laser shock peening（LSP） and microstructure,residual stress and microhardness with and without LSP were examined and compared via transmission electron microscope（TEM）,X-ray diffractometer and microhardness tester.The TEM results indicate that a great high density of dislocations are generated and evolve into the dislocation wall,sub-boundary and grain boundary.The nanocrystallines are formed and become smaller and more uniform with greater impacts.A high compressive residual stress above-540MPa is introduced with an increasing plastically affected layer with different impacts.The microhardness test result shows that LSP can obviously increase the hardness by 20 percent or so,and the affected depth increases with the impact from 600μm to 1200 μm.