针对近 β 型 TLM 钛合金试样表面进行了不同时间的高能喷丸处理，采用金相显微镜(OM)、扫描电子显微镜(SEM)、X 射线衍射仪(XRD)以及显微硬度仪等对不同喷丸处理后的试样进行了组织观察和性能测试。 研究发现，在喷丸的近表层发生了纳米化，形成了一定厚度的纳米晶层。 喷丸处理时间越长，最表层的平均晶粒尺寸越小，晶粒尺寸沿着厚度方向有梯度变化，距喷丸表面越远，晶粒尺寸就会越大。 同时纳米晶层的显微硬度相对于基体组织有大幅提 高，显微硬度距表面距离越远，显微硬度越低，硬度的提升主要是由于表面晶粒细晶强化的作用所致。

In this study, surface of type near β-type TLM titanium alloy samples were subjected to high-energy shot peening treatment at different time. The microstructure and mechanical properties of the samples after different shot peening time were observed using metallographic microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and microhardness testing. Research has shown that nanocrystallization occurs near the surface of samples after shot peening, forming a certain thickness of nanocrystalline layer. As the duration of the shot peening treatment increases, the average grain size of the surface layer decreases, and the grain size has a gradient change along the thickness direction. The further away from the shot peening surface, the larger the grain size will be. Moreover, compared with that of the matrix, the microhardness of the nanocrystalline layer significantly improves. The greater the distance from the surface is, the lower the microhardness. The increase in hardness is mainly due to the strengthening effect of surface grain refinement.