Microstructure, elastic deformation behavior and mechanical properties of biomedical β-type titanium alloy thin-tube used for stents

Yuxing Tian; Zhentao Yu; Chun Yee Aaron Ong; Damon Kent; Gui Wang

doi:10.1016/j.jmbbm.2015.02.001

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Microstructure, elastic deformation behavior and mechanical properties of biomedical β-type titanium alloy thin-tube used for stents

Journal article

Peer reviewed

Microstructure, elastic deformation behavior and mechanical properties of biomedical β-type titanium alloy thin-tube used for stents

Yuxing Tian, Zhentao Yu, Chun Yee Aaron Ong, Damon Kent and Gui Wang

Journal of the Mechanical Behavior of Biomedical Materials, Vol.45, pp.132-141

2015

DOI: https://doi.org/10.1016/j.jmbbm.2015.02.001

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Abstract

Biomedical Engineering

Materials Engineering

Mechanical Engineering

β-Type titanium alloy

thin-tube

elastic deformation behavior

α″ Martensite

phase precipitation

Cold-deformability and mechanical compatibility of the biomedical β-type titanium alloy are the foremost considerations for their application in stents, because the lower ductility restricts the cold-forming of thin-tube and unsatisfactory mechanical performance causes a failed tissue repair. In this paper, β-type titanium alloy (Ti-25Nb-3Zr-3Mo-2Sn, wt%) thin-tube fabricated by routine cold rolling is reported for the first time, and its elastic behavior and mechanical properties are discussed for the various microstructures. The as cold-rolled tube exhibits nonlinear elastic behavior with large recoverable strain of 2.3%. After annealing and aging, a nonlinear elasticity, considered as the intermediate stage between "double yielding" and normal linear elasticity, is attributable to a moderate precipitation of α phase. Quantitive relationships are established between volume fraction of α phase (Vα) and elastic modulus, strength as well as maximal recoverable strain (Îµmax-R), where the Îµmax-R of above 2.0% corresponds to the Vα range of 3-10%. It is considered that the "mechanical" stabilization of the (α+β) microstructure is a possible elastic mechanism for explaining the nonlinear elastic behavior.

Details

Title: Microstructure, elastic deformation behavior and mechanical properties of biomedical β-type titanium alloy thin-tube used for stents
Authors: Yuxing Tian (Author) - National University of Singapore, Singapore
Zhentao Yu (Author) - Northwest Institute for Non-ferrous Metal Research (NIN), China
Chun Yee Aaron Ong (Author) - National University of Singapore, Singapore
Damon Kent (Author) - University of Queensland
Gui Wang (Author) - University of Queensland
Publication details: Journal of the Mechanical Behavior of Biomedical Materials, Vol.45, pp.132-141
Publisher: Elsevier BV
Date published: 2015
DOI: 10.1016/j.jmbbm.2015.02.001
ISSN: 1751-6161
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99450064602621
Output Type: Journal article

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Collaboration types: Industry collaboration; Domestic collaboration; International collaboration
Web Of Science research areas: Engineering, Biomedical; Materials Science, Biomaterials