Mechanical properties of TiNi medical alloy with bioinert coatings

V.V. Rubanik, D.A. Bahrets ORCID logo , V.V. Rubanik jr. ORCID logo , V.I. Urban, V.G. Dorodeiko, V.A. Andreev, N.M. Chekan, I.P. Akula show affiliations and emails
Received: 04 September 2023; Revised: 10 October 2023; Accepted: 16 October 2023
Citation: V.V. Rubanik, D.A. Bahrets, V.V. Rubanik jr., V.I. Urban, V.G. Dorodeiko, V.A. Andreev, N.M. Chekan, I.P. Akula. Mechanical properties of TiNi medical alloy with bioinert coatings. Lett. Mater., 2023, 13(4) 353-356
BibTex   https://doi.org/10.22226/2410-3535-2023-4-353-356

Abstract

The Ti-50.8 at.% Ni (TiNi) medical alloy wire samples with bioinert PVD-coatings of different compositions were studied. The elastic-force characteristics (phase yield strength σM, mechanical hysteresis value ΔH, residual deformation εres, and unloading plateau stress σc) of TiNi have been studied based on the stress-strain curves obtained at different temperatures (5°С, 19°С, 37°С, and 60°С).The Ti-50.8 at.% Ni (TiNi) medical alloy wire samples with bioinert coatings of different compositions prepared by PVD methods (magnetron sputtering — Ta, arc-PVD — ZrN, and DLC) were studied in this work. Three-point bending tests were performed to investigate the mechanical properties of the samples under loading up to 6 % and unloading. The elastic-force characteristics (phase yield strength, mechanical hysteresis value, residual deformation, and unloading plateau stress) of TiNi have been studied based on the stress-strain curves obtained at different temperatures (5°С, 19°С, 37°С, and 60°С). It is shown that the magnetron sputtering process does not significantly affect the elastic-force characteristics of titanium nickelide due to the absence of temperature effects, which makes it possible to use this method for obtaining bioinert coatings on medical products (orthodontic archwires) while maintaining predetermined functional properties. In contrast, the arc-PVD process, due to the high-energy effect on the substrate material, causes significant changes in the elastic-force characteristics of the TiNi alloy, which can be controlled by varying the temperature regime of the deposition process, allowing the operations of setting functional properties and deposition of a bioinert coating to be combined.

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