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Metals 2018, 8(1), 1; https://doi.org/10.3390/met8010001

The α → ω Transformation in Titanium-Cobalt Alloys under High-Pressure Torsion

1
Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
2
Institute of Solid State Physics, Russian Academy of Sciences, Ac. Ossipyan str. 2, Chernogolovka 142432, Russia
3
National University of Science and Technology (MISIS), Leninskii prosp. 4, Moscow 119049, Russia
*
Author to whom correspondence should be addressed.
Received: 10 November 2017 / Revised: 10 December 2017 / Accepted: 18 December 2017 / Published: 21 December 2017
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Abstract

The pressure influence on the α → ω transformation in Ti–Co alloys has been studied during high pressure torsion (HPT). The α → ω allotropic transformation takes place at high pressures in titanium, zirconium and hafnium as well as in their alloys. The transition pressure, the ability of high pressure ω-phase to retain after pressure release, and the pressure interval where α and ω phases coexist depend on the conditions of high-pressure treatment. During HPT in Bridgeman anvils, the high pressure is combined with shear strain. The presence of shear strain as well as Co addition to Ti decreases the onset of the α → ω transition from 10.5 GPa (under quasi-hydrostatic conditions) to about 3.5 GPa. The portion of ω-phase after HPT at 7 GPa increases in the following sequence: pure Ti → Ti–2 wt % Co → Ti–4 wt % Co → Ti–4 wt % Fe. View Full-Text
Keywords: high-pressure torsion; Ti–Co alloys; phase transitions; pressure influence high-pressure torsion; Ti–Co alloys; phase transitions; pressure influence
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Kilmametov, A.R.; Ivanisenko, Y.; Straumal, B.B.; Gornakova, A.S.; Mazilkin, A.A.; Hahn, H. The α → ω Transformation in Titanium-Cobalt Alloys under High-Pressure Torsion. Metals 2018, 8, 1.

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