Phase transformations during high-pressure torsion (HPT) in titanium, cobalt and graphite

6th International Conference on Nanomaterials by Severe Plastic Deformation

材料科学;化学

Edalati, Kaveh^1,2 ; Horita, Zenji^1,2

WPI, International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 819-0395, Japan^1

Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan^2

关键词: Cryogenic temperatures;    Diamond like carbon;    FCC phase;    Grain size;    High pressure torsions;    Nanometer level;    Omega phase;    Submicrometers;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/63/1/012099/pdf
DOI  :  10.1088/1757-899X/63/1/012099

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Several elements were processed by high-pressure torsion and phase transformations were investigated. Titanium exhibited a transition from hcp to an ω phase at pressures higher than 4 GPa, while the transition was facilitated with increasing the shear strain. The stability of ω phase appeared to decrease with decreasing the grain size to the nanometer level (e.g., by processing at cryogenic temperatures and/or by consolidation of powders). Cobalt exhibited a transition from metastable fcc to hcp until the grain size reached the submicrometer level, but the fcc phase appeared to be more stable with decreasing the grain size to the nanometer level. Graphite exhibited a transition to diamond-like carbon (DLC), while the formation of DLC was facilitated with increasing the pressure, temperature and strain.