Mechanocyclic and Time Stability of the Loading-Unloading Diagram Parameters of Nanostructured Ti-Nb-Ta and Ti-Nb-Zr SMA

Abstract:

The Ti-21.8Nb-6Zr and Ti-19.7Nb-5.8Ta (at.%) shape memory alloys are thermomechanically treated by cold drawing and post-deformation annealing at 550-600°C forming a nanosubgrained structure in the β-phase. Cyclic mechanical testing using a “loading-unloading” mode with 2% tensile strain in each half-cycle reveals the non-perfect superelastic behavior of both alloys during the very first cycles of testing, which becomes perfect during further mechanocycling. The Young’s modulus of thermomechanically-treated alloys is low (about 45 GPa), and it decreases during mechanocycling (n=10 cycles) down to 25-35 GPa, approaching the Young’s modulus of cortical bone tissues. The Young’s modulus obtained in the 10th cycle is stable or changes only slightly during a further 40-day pause at room temperature and then during repeated mechanocycling. The residual strain per cycle, the transformation yield stress and the mechanical hysteresis decrease during mechanocycling. Subsequent to a 40-day pause at room temperature, they restore their initial values. Repeated mechanocycling is accompanied by a repeated decrease of these parameters.

• Periodical: Materials Science Forum (Volumes 738-739)
• Pages: 481-485
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.738-739.481
• Online since: January 2013
• Authors: Sergey Prokoshkin, Vladimir Brailovski, Mikhail Petrzhik, Mikhail R. Filonov, Vadim Sheremetyev
• Keywords: Functional Fatigue, Nanostructure, SMA, Superelasticity, Thermomechanical Treatment (TMT), Titanium-Based Alloy

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