Study on the microstructure and grinding resistance of nanocrystalline Ti-4Al-2V alloy

The Ti-4Al-2V alloy was investigated and a nanocrystalline surface constitution was obtained. The microstructure characteristic and grinding behavior have been studied. After the surface deformation, the grain size of the nanocrystalline layer is about 10 nm similar to 70 nm. Slip band was found in the deformation surface layer. A peeling off structure was found in the transition zone. The composition of surface structure was changed after the deformation. It may be due to some elements of the pellet diffused into the sample. The grinding resistance of the nanocrystalline surface is much better than that of the coarse grain surface. The microstructure observation result indicates that the nanocrystalline surface grinding mechanism is particle grinding mechanism of harder material, and the coarse grain surface grinding mechanism is adherence grinding mechanism. The influence factors on the grinding resistance of the nanocrystalline surface are discussed.