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采用超声深滚技术对Ti6Al4V合金进行表面机械强化处理,使用扫描电镜、硬度分析、X射线衍射和透射电镜等分析手段研究超声深滚处理Ti6Al4V合金表面层的组织结构特征。结果表明:超声深滚处理后,材料表层组织严重细化,形成了纳米结构层,表面晶粒尺寸小于20nm。晶粒细化层的深度约为0.15mm,在0.15mm深度处,虽然晶界结构保持完整但晶粒内部位错密度增加。分析了组织结构细化对于改善疲劳性能的意义。
The mechanical strengthening of Ti6Al4V alloy was carried out by ultrasonic deep rolling technique. The microstructure of Ti6Al4V alloy surface was studied by scanning electron microscopy, hardness analysis, X-ray diffraction and transmission electron microscopy. The results show that the surface texture of the material is severely refined after the ultrasonic deep-rolling treatment to form a nanostructured layer with a surface grain size of less than 20 nm. The grain refinement layer has a depth of about 0.15 mm. At a depth of 0.15 mm, the dislocation density increases within the grain although the grain boundary structure remains intact. The significance of organizational structure refinement for improving fatigue performance was analyzed.