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Long-term stability of superelastic behavior of nanosubgrained Ti-Nb-Zr and Ti-Nb-Ta shape memory alloys

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Sheremetyev, V., Prokoshkin, S., Brailovski, V., Dubinskiy, S., Filonov, M. et Petrzhik, M.. 2015. « Long-term stability of superelastic behavior of nanosubgrained Ti-Nb-Zr and Ti-Nb-Ta shape memory alloys ». [Conference paper]. Materials Today: Proceedings, vol. 2, nº suppl. 1. S26-S31.

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Abstract

Ti-21.8Nb-6Zr and Ti-19.7Nb-5.8Ta (at.%) shape memory alloys for medical implants were subjected to a thermomechanical treatment comprising cold rolling and post-deformation annealing. The evolutions of their structure and their superelastic behavior were monitored during mechanical “loading-unloading” 10-cycle testing (3 times) and during long-term pauses between testing (40 and 365 days). During the first multicycle testing of the Ti-Nb-Ta alloy, its Young's modulus showed a significant decrease (from 30 GPa - 40 GPa to 20 GPa - 25 GPa). It regained its initial value after a first pause, and then decreased again during re-testing, but to a smaller extent, regaining its initial value after the second pause and finally stabilizing. The Ti-Nb-Zr alloy demonstrated more stable SE behavior than the Ti-Nb-Ta alloy: its Young's modulus showed only a 10 % decrease during the first mechanical cycling (from 31 GPa - 40 GPa to 27 GPa - 37 GPa), restored its initial value after a first pause and then remained stable.

Item Type: Peer reviewed article published in a journal
Additional Information: Conference MEFORM 2015, Light Metals – Forming Technologies and Further Processing
Professor:
Professor
Brailovski, Vladimir
Affiliation: Génie mécanique
Date Deposited: 03 Dec 2015 14:47
Last Modified: 25 Apr 2016 21:05
URI: http://espace2.etsmtl.ca/id/eprint/11926

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