University of Oulu

S. Sadeghpour, S.M. Abbasi, M. Morakabati, L.P. Karjalainen, Effect of dislocation channeling and kink band formation on enhanced tensile properties of a new beta Ti alloy, Journal of Alloys and Compounds, Volume 808, 2019, 151741, ISSN 0925-8388, https://doi.org/10.1016/j.jallcom.2019.151741

Effect of dislocation channeling and kink band formation on enhanced tensile properties of a new beta Ti alloy

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Author: Sadeghpour, S.1,2; Abbasi, S.M.1; Morakabati, M.1;
Organizations: 1Metallic Materials Research Center, Malek Ashtar University of Technology, Tehran, Iran
2Centre for Advanced Steels Research, University of Oulu, 90014, Oulu, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2019093030468
Language: English
Published: Elsevier, 2019
Publish Date: 2021-08-06
Description:

Abstract

Tensile properties and deformation mechanisms of a newly developed β Ti alloy, Ti–3Al–8Mo–7V–3Cr (wt.%), were investigated at room temperature. The alloy was found to exhibit a yield point at high strength level of 920 MPa and excellent total elongation of 31%. The yield point was presumably caused by the oxygen in the alloy, although the nano-sized omega precipitates were present, too. The examinations of deformed microstructures at different strains using transmission electron microscope and electron backscatter diffraction showed that during straining dislocation glide occurred in narrow channels and kink bands were formed leading to a high ductility. The competing effect of strain hardening by intersecting of channels and twins and softening by kink band formation results in a flat plateau-type engineering stress-strain curve.

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Series: Journal of alloys and compounds
ISSN: 0925-8388
ISSN-E: 1873-4669
ISSN-L: 0925-8388
Volume: 808
Article number: 151741
DOI: 10.1016/j.jallcom.2019.151741
OADOI: https://oadoi.org/10.1016/j.jallcom.2019.151741
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Subjects:
Copyright information: © 2019 Published by Elsevier B.V. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
  https://creativecommons.org/licenses/by-nc-nd/4.0/