Research on the Microstructure of Surface Gradient Nanostructure on Pure Titanium

Author of the article:TU Tao 1,2 , TIAN Jun 1,2 , LI Jizhen 3 , DAI Pan 4 , XU Chunjie 2,5

Author's Workplace：(1. Meigaomei Nobel Prize (Tongchuan) New Materials Co., Ltd., Tongchuan 727031, China; 2. Xi'an Shechtman Nobel Prize New Materials Institute, Xi'an 710048, China; 3. Xi'an North qinghua mechanical and electrical co., Ltd., Xi'an 710025, China; 4. China School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China; 5. School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China

Key Words： pure titanium; gradient nanostructure; microstructure

Abstract：The gradient nano-treatment was carried out on the surface of pure titanium by mechanical milling. The
microstructure changes of the gradient nano-structure on the surface of pure titanium were characterized and the
deformation mechanism of the surface nano-treatment was discussed. The results show that with the increase of the distance
from the surface, the grain size of pure titanium milled by mechanical milling increases from nano-scale to macro-scale
with a continuous gradient change, and the depth of fine grain layer and deformation layer is about 30 μm and 110 μm,
respectively. The deep refinement of fine twin lamellae in the mechanical milling process is mainly by mechanical shear
cutting to form a large number of disordered submicrograins, which are realized by nucleation and recrystallization.