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

Tian, Yuxing, Yu, Zhentao, Ong, Chun Yee Aaron, Kent, Damon and Wang, Gui (2015) Microstructure, elastic deformation behavior and mechanical properties of biomedical β-type titanium alloy thin-tube used for stents. Journal of the Mechanical Behavior of Biomedical Materials, 45 132-141. doi:10.1016/j.jmbbm.2015.02.001


Author Tian, Yuxing
Yu, Zhentao
Ong, Chun Yee Aaron
Kent, Damon
Wang, Gui
Title Microstructure, elastic deformation behavior and mechanical properties of biomedical β-type titanium alloy thin-tube used for stents
Journal name Journal of the Mechanical Behavior of Biomedical Materials   Check publisher's open access policy
ISSN 1878-0180
1751-6161
Publication date 2015-05-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.jmbbm.2015.02.001
Volume 45
Start page 132
End page 141
Total pages 10
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2016
Language eng
Formatted abstract
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 (εmax-R), where the εmax-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.
Keyword β-Type titanium alloy
Thin-tube
Elastic deformation behavior
α″ Martensite
Phase precipitation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2016 Collection
 
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