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ArticleName Texture formation in biomedical superelastic Ti – Zr – Nb alloys during rolling and subsequent heat treatment
DOI 10.17580/tsm.2022.10.11
ArticleAuthor Zaripova M. M., Isaenkova M. G., Fesenko V. A., Osintsev A. V.

National Research Nuclear University MEPhI, Moscow, Russia:

Zaripova M. M., Postgraduate Student, Engineer, e-mail:
Isaenkova M. G., Professor, Doctor of Physical and Mathematical Sciences

Fesenko V. A., Lead Engineer
Osintsev A. V., Acting Head of the Department, Candidate of Technical Sciences


Currently, low-modulus biocompatible Ti – Nb – Zr alloys are considered promising for medical applications. Superelasticity is a property that is mainly governed by the crystallographic direction in single crystals, i.e. by the predominant orientation of grains in polycrystalline objects. In order to control the crystallographic texture in products (such as foils), one should understand how it forms at various stages of thermomechanical processing. This paper compares the following alloys in terms of their crystallographic texture and how it forms: Ti –18Zr – 15Nb (18-15), Ti – 6Zr – 22Nb (22-6), Ti – 22Nb – (1–1.5)O (1O and 1.5O) (at.%). The composition of an alloy influences the stability of the initial β-phase, which tends to decrease with an increase in the concentration of Zr, which replaces Nb. A decreasing stability triggers martensitic transformations during rolling resulting in the formation of a weak blurry texture {112}<011>, as can be observed during deformation of alloy 18-15. Plastic deformation of a stable β-phase leads to the formation of a sharp twocomponent texture typical of BCC alloys: {110}<001> and {112}<011>, which develops during the rolling of alloys with oxygen and 22-6. Recrystallization of rolled foils (ε = 92%) at 650 оC for 0.5 h leads to sharpening of the texture components in the case of samples with a sharp deformation texture (22-6, 1O, 1 .5O) and to a change in texture in the case of samples with a weak deformation texture (18-15). Cyclic tensile tests conducted in three different directions revealed the presence of anisotropy in foils of all compositions. However, alloy 18-15 has the lowest anisotropy. An increase in the Zr concentration contributes to maximum reversible strain in the process of realizing superelasticity at room temperature.

This research was funded by the Ministry of Science and Higher Education of the Russian Federation; Agreement No. 075-15-2021-1352.

keywords Martensitic transformations, shape memory effect, superelasticity, crystallographic texture, Ti – Nb – Zr, biomedical alloy, rolling, heat treatment of foils.

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