Shear induced ω-phase in titanium
A.P. Zhilyaev, V.A. Popov, A.R. Sharafutdinov, V.N. Danilenko show affiliations and emails
Received: 07 October 2011; Revised: 10 January 2012; Accepted: 07 October 2011
Citation: A.P. Zhilyaev, V.A. Popov, A.R. Sharafutdinov, V.N. Danilenko. Shear induced ω-phase in titanium. Lett. Mater., 2011, 1(4) 203-207
@article{Zhilyaev2011,
author="A.P. Zhilyaev and V.A. Popov and A.R. Sharafutdinov and V.N. Danilenko",
title="Shear induced ω-phase in titanium",
The metastable ω-phase of titanium, which has a nanocrystalline structure (with a crystallite size of 50 nm) was formed by severe plastic deformation (SPD), namely, torsion under high quasi-hydrostatic (6 GPa) pressure. It is shown that a short incubation period (300 seconds), more than 90% α-titanium is transformed into ω-phase, while the static load at the same time does not lead to phase transformation. TEM shows that the ω-phase is formed near the grain boundaries (GBs), the initial phase, which allows to hypothesize that the α → ω martensitic transformation occurs due to the increase of in-ternal stress near the grain boundaries, greatly exceeding the external load and is the channel of dissipation of plastic energy.
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