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

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

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

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Résumé

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.

Type de document: Article publié dans une revue, révisé par les pairs
Informations complémentaires: Conference MEFORM 2015, Light Metals – Forming Technologies and Further Processing
Professeur:
Professeur
Brailovski, Vladimir
Affiliation: Génie mécanique
Date de dépôt: 03 déc. 2015 14:47
Dernière modification: 25 avr. 2016 21:05
URI: http://espace2.etsmtl.ca/id/eprint/11926

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