Luo Sihai, Zhou Liucheng, Wang Xuede, Cao Xin, Nie Xiangfan, He Weifeng
Science and Technology on Plasma Dynamics Laboratory, Air Force Engineering University, Xi'an 710038, China.
School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China.
Materials (Basel). 2018 Apr 6;11(4):563. doi: 10.3390/ma11040563.
As an innovative surface technology for ultrahigh strain-rate plastic deformation, laser shock peening (LSP) was applied to the dual-phase TC11 titanium alloy to fabricate an amorphous and nanocrystalline surface layer at room temperature. X-ray diffraction, transmission electron microscopy, and high-resolution transmission electron microscopy (HRTEM) were used to investigate the microstructural evolution, and the deformation mechanism was discussed. The results showed that a surface nanostructured surface layer was synthesized after LSP treatment with adequate laser parameters. Simultaneously, the behavior of dislocations was also studied for different laser parameters. The rapid slipping, accumulation, annihilation, and rearrangement of dislocations under the laser-induced shock waves contributed greatly to the surface nanocrystallization. In addition, a 10 nm-thick amorphous structure layer was found through HRTEM in the top surface and the formation mechanism was attributed to the local temperature rising to the melting point, followed by its subsequent fast cooling.
作为一种用于超高应变速率塑性变形的创新表面技术，激光冲击喷丸（LSP）被应用于双相TC11钛合金，以在室温下制备非晶和纳米晶表面层。采用X射线衍射、透射电子显微镜和高分辨率透射电子显微镜（HRTEM）研究微观结构演变，并讨论变形机制。结果表明，在适当的激光参数下进行LSP处理后，合成了表面纳米结构表面层。同时，还研究了不同激光参数下的位错行为。激光诱导冲击波作用下位错的快速滑移、积累、湮灭和重排对表面纳米晶化有很大贡献。此外，通过HRTEM在顶面发现了一层10nm厚的非晶结构层，其形成机制归因于局部温度升高到熔点，随后快速冷却。
