ω phase strengthened 1.2GPa metastable β titanium alloy with high ductility

Abstract

This paper provides a novel approach for exploiting ω phase strengthening in a metastable β titanium alloy while retaining high ductility. The addition of 1 wt% Fe into our previously designed Ti-7Mo-3Cr alloy can efficiently control the growth of ω phase following air-cooling, resulting in a ultrahigh yield strength (Rp0.2of 1210 MPa) with large ductility (εf of 0.15). Microstructural analysis of deformed alloys showed that the growth of ω phase in the air-cooled Ti-7Mo-3Cr-1Fe alloy modified the deformation mechanism from {332} twinning and dislocation slip, in the water-quenched alloy, to localized dislocation plasticity in ω-void channels.

Metadata

Authors/Creators:

Gao, J.
Knowles, A.J.
Guan, D. https://orcid.org/0000-0002-3953-2878
Rainforth, W.M. https://orcid.org/0000-0003-3898-0318

© 2018 Published by Elsevier Ltd on behalf of Acta Materialia Inc. This is an author produced version of a paper subsequently published in Scripta Materialia. Uploaded in accordance with the publisher's self-archiving policy. Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/).

Keywords:

Metastable beta titanium alloy; ω phase; Strengthening; Yield strength

Dates: