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; Accepted 07 October 2011;
This paper is written in Russian
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
BibTex   https://doi.org/10.22226/2410-3535-2011-4-203-207

Abstract

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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