Evolution of the microstructure and mechanical properties during fabrication of mini-tubes from a biomedical beta-titanium alloy

Zhang, Yaowu, Kent, Damon, Wang, Gui, St John, David and Dargusch, Matthew (2015) Evolution of the microstructure and mechanical properties during fabrication of mini-tubes from a biomedical beta-titanium alloy. Journal of the Mechanical Behavior of Biomedical Materials, 42 207-218. doi:10.1016/j.jmbbm.2014.11.013


Author Zhang, Yaowu
Kent, Damon
Wang, Gui
St John, David
Dargusch, Matthew
Title Evolution of the microstructure and mechanical properties during fabrication of mini-tubes from a biomedical beta-titanium alloy
Formatted title
Evolution of the microstructure and mechanical properties during fabrication of mini-tubes from a biomedical β-titanium alloy
Journal name Journal of the Mechanical Behavior of Biomedical Materials   Check publisher's open access policy
ISSN 1878-0180
1751-6161
Publication date 2015-02-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.jmbbm.2014.11.013
Open Access Status
Volume 42
Start page 207
End page 218
Total pages 12
Place of publication Amsterdam Netherlands
Publisher Elsevier
Collection year 2015
Language eng
Formatted abstract
The processing of Ti–25Nb–3Mo–3Zr–2Sn tubes with outside diameters of 5.6–8.0 mm and wall-thicknesses of 0.7–1.0 mm were investigated in order to study the evolution of microstructure and mechanical properties and their impact on the processing of the tubes. The annealed small tubes with single β phase microstructures exhibit double yielding during tensile tests. The onset of martensitic phase transformation was observed to occur after the lowest point of the strain hardening. Cold rolling also activates the formation of the stress induced martensitic α″ phase. Its volume fraction increased with increasing ε. The rate of strain hardening and the modulus of the tubes are related to the stress induced transformation of the β phase to the α″ phase. The stress induced α″ slightly improves the yield strength of the tubes at low levels of strain. However, larger strains result in grain growth during annealing, which diminishes the mechanical properties.
Keyword Metastable β-titanium alloy
Cold rolling
Annealing
Double yielding
Martensitic transformation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online ahead of print 3 Dec 2014

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2015 Collection
 
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