Simultaneously enhanced strength and ductility in a metastable β-Ti alloy by stress-induced hierarchical twin structure

Lei Ren; Wenlong Xiao; Damon Kent; Min Wan; Chaoli Ma; Lian Zhou

doi:10.1016/j.scriptamat.2020.03.039

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Simultaneously enhanced strength and ductility in a metastable β-Ti alloy by stress-induced hierarchical twin structure

Journal article

Peer reviewed

Simultaneously enhanced strength and ductility in a metastable β-Ti alloy by stress-induced hierarchical twin structure

Lei Ren, Wenlong Xiao, Damon Kent, Min Wan, Chaoli Ma and Lian Zhou

Scripta Materialia, Vol.184, pp.6-11

2020

DOI: https://doi.org/10.1016/j.scriptamat.2020.03.039

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Abstract

metastable β-Ti alloy

microstructure

strength

ductility

hierarchical twin structure

A novel metastable β-Ti alloy Ti-4Mo-3Cr-1Fe with high strength and high ductility was developed through controlling the alloy's stability and deformation mechanisms. The microstructure consists of randomly oriented β-grains containing an even distribution of athermal ω precipitates. Under tensile loading, the alloy exhibits unprecedented and comprehensive mechanical properties including a high yield strength of 870 MPa, excellent total elongation of 41% and an ultrahigh strain hardening rate of 2.5 GPa. Based on investigations of deformation microstructures, the superior mechanical properties are attributed to stress-induced formation of a complex nano-scale hierarchical twin structure which is promoted by reversion of ω precipitates.

Details

Title: Simultaneously enhanced strength and ductility in a metastable β-Ti alloy by stress-induced hierarchical twin structure
Authors: Lei Ren (Author) - Beihang University, China
Wenlong Xiao (Author) - Beihang University, China
Damon Kent (Author) - University of the Sunshine Coast - School of Science and Engineering
Min Wan (Author) - Beihang University, China
Chaoli Ma (Author) - Beihang University, China
Lian Zhou (Author) - Beihang University, China
Publication details: Scripta Materialia, Vol.184, pp.6-11
Publisher: Elsevier Ltd.
Date published: 2020
DOI: 10.1016/j.scriptamat.2020.03.039
ISSN: 1359-6462
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99450984202621
Output Type: Journal article

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