Effects of Initial Micro-Structures on Deformation Behaviors of Commercial Pure Titanium

Abstract:

In this paper, effects of initial micro-structures on deformation behaviors of commercial pure titanium were elaborated by investigating the evolution of dislocation boundary and its adiabatic shear sensitivity. At the low to medium stain rates, the main plastic deformation mechanism of as-annealed commercial pure titanium is dislocation slipping. Meanwhile, geometrically necessary boundaries (GNBs) with different directions are generated and crossed with each other. However, new dislocation boundaries are formed in as-cold rolled plates, which are parallel to the initial ones induced by cold rolling. When the strain rate is up to 1000 s^-1, the initial dislocation boundary playes an adverse role in the adiabatic shear sensitivity of commercial pure titanium. The adiabatic shear band is the high-speed deformation characteristic micro-structure in commercial pure titanium. In addition, dynamic recrystallized grains are generated in the center of an adiabatic shear band, which is consistent with the sub-grain rotation mechanism.

• Periodical: Materials Science Forum (Volume 879)
• Pages: 2050-2054
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.879.2050
• Online since: November 2016
• Authors: Tong Bo Wang, Bo Long Li*, Mian Li, Zuo-Ren Nie
• Keywords: Adiabatic Shear Band, Dislocation Boundary, Slipping

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