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The Electrochemical and Mechanical Behavior of Bulk and Porous Superelastic Ti‒Zr-Based Alloys for Biomedical Applications

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Center of Nanomaterials and Nanotechnologies, National University of Science and Technology “MISIS”, 4 Leninskiy prospekt, Moscow 119049, Russia
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Metal Forming Department, National University of Science and Technology “MISIS”, 4 Leninskiy prospekt, Moscow 119049, Russia
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Materials Science of Semiconductors and Dielectrics Department, National University of Science and Technology “MISIS”, 4 Leninskiy prospekt, Moscow 119049, Russia
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Department of Functional Nanosystems and High-Temperature Materials, National University of Science and Technology “MISIS”, 4 Leninskiy prospekt, Moscow 119049, Russia
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Shape Memory Alloys and Intelligent Systems Laboratory (LAMSI), École de Technologie Supérieure (ETS), 1100 Notre-Dame Street West, Montreal, QC H3C 1K3, Canada
*
Author to whom correspondence should be addressed.
Materials 2019, 12(15), 2395; https://doi.org/10.3390/ma12152395
Received: 26 June 2019 / Revised: 16 July 2019 / Accepted: 25 July 2019 / Published: 27 July 2019
Titanium alloys are well recognized as appropriate materials for biomedical implants. These devices are designed to operate in quite aggressive human body media, so it is important to study the corrosion and electrochemical behavior of the novel materials alongside the underlying chemical and structural features. In the present study, the prospective Ti‒Zr-based superelastic alloys (Ti-18Zr-14Nb, Ti-18Zr-15Nb, Ti-18Zr-13Nb-1Ta, atom %) were analyzed in terms of their phase composition, functional mechanical properties, the composition and structure of surface oxide films, and the corresponding corrosion and electrochemical behavior in Hanks’ simulated biological solution. The electrochemical parameters of the Ti-18Zr-14Nb material in bulk and foam states were also compared. The results show a significant difference in the functional performance of the studied materials, with different composition and structure states. In particular, the positive effect of the thermomechanical treatment regime, leading to the formation of a favorable microstructure on the corrosion resistance, has been revealed. In general, the Ti-18Zr-15Nb alloy exhibits the optimum combination of functional characteristics in Hanks’ solution, while the Ti-18Zr-13Nb-1Ta alloy shows the highest resistance to the corrosion environment. The Ti-18Zr-14Nb-based foam material exhibits slightly lower passivation kinetics as compared to its bulk equivalent. View Full-Text
Keywords: shape memory materials; superelastic materials; implants; thermomechanical treatment; microstructure; martensitic transformation; corrosion resistance; oxide film; biocompatibility shape memory materials; superelastic materials; implants; thermomechanical treatment; microstructure; martensitic transformation; corrosion resistance; oxide film; biocompatibility
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Zhukova, Y.; Korobkova, A.; Dubinskiy, S.; Pustov, Y.; Konopatsky, A.; Podgorny, D.; Filonov, M.; Prokoshkin, S.; Brailovski, V. The Electrochemical and Mechanical Behavior of Bulk and Porous Superelastic Ti‒Zr-Based Alloys for Biomedical Applications. Materials 2019, 12, 2395.

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