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.
|ジャーナル||IOP Conference Series: Materials Science and Engineering|
|出版ステータス||出版済み - 2014|
|イベント||6th International Conference on Nanomaterials by Severe Plastic Deformation, NanoSPD 2014 - Metz, フランス|
継続期間: 6月 30 2014 → 7月 4 2014
All Science Journal Classification (ASJC) codes