Precipitation of the α-phase in an ultrafine grained beta-titanium alloy processed by severe plastic deformation

Tong Li; Damon Kent; Gang Sha; Matthew S Dargusch; Julie M Cairney

doi:10.1016/j.msea.2014.03.044

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Precipitation of the α-phase in an ultrafine grained beta-titanium alloy processed by severe plastic deformation

Journal article

Peer reviewed

Precipitation of the α-phase in an ultrafine grained beta-titanium alloy processed by severe plastic deformation

Tong Li, Damon Kent, Gang Sha, Matthew S Dargusch and Julie M Cairney

Materials Science & Engineering A, Vol.605, pp.144-150

2014

DOI: https://doi.org/10.1016/j.msea.2014.03.044

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Abstract

Materials Engineering

Mechanical Engineering

titanium alloys

bulk deformation

precipitation

nanostructured materials

electron microscopy

atom probe FIM

A fine and uniform distribution of α phase at grain boundaries is expected to improve the mechanical properties and thermal stability of beta Ti alloys. To design high strength alloys, a key factor is the volume fraction of α, which is related to the concentration of the α phase. In this study, α-phase precipitates were characterized in an ultrafine-grained Ti-15Nb-2Mo-2Zr-1Sn (at%) alloy processed by severe plastic deformation in two different ways (hot drawing and cold rolling in conjunction with annealing). A combination of transmission Kikuchi diffraction, transmission electron microscopy and atom-probe tomography revealed that ultra-fine α precipitates precipitate at grain boundaries in hot-drawn material or at sub-grain boundaries in the cold-rolled samples. The Nb concentrations of α phases formed were not those expected for an equilibrium state, which highlights the importance of understanding the chemistry of the α precipitates for engineering microstructures in advanced Ti alloys.

Details

Title: Precipitation of the α-phase in an ultrafine grained beta-titanium alloy processed by severe plastic deformation
Authors: Tong Li (Author)
Damon Kent (Author) - University of Queensland
Gang Sha (Author) - University of Sydney
Matthew S Dargusch (Author) - University of Queensland
Julie M Cairney (Author) - University of Sydney
Publication details: Materials Science & Engineering A, Vol.605, pp.144-150
Publisher: Elsevier BV
Date published: 2014
DOI: 10.1016/j.msea.2014.03.044
ISSN: 0921-5093; 0921-5093
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99448877102621
Output Type: Journal article

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Collaboration types: Domestic collaboration
Web Of Science research areas: Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Nanoscience & Nanotechnology