Ti6Al4V合金超声深滚层的组织结构特征

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20 nm。晶粒细化层的深度约为0.15 mm，在0.15 mm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

Microstructure Characteristics of Ultrasound-Aided Deep Rolling Treated Ti6Al4V Alloy

Ti6Al4V alloy was treated by ultrasound-aided deep rolling(UADR) for surface mechanical strengthening. The microstructure evolution of the UADR treated specimen was characterized by scanning electron microscopy(SEM) ,hardness test,X-ray diffraction(XRD) and transmission electron microscopy(TEM) . The results show that obvious grain refinement is found after UADR treatment and a nano-structured surface layer is formed with an average grain size less than 20 nm in the immediate surface. Grain boundaries at ab...