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Study of Low-Temperature Thermomechanical Behavior of the Ti–18Zr–15Nb Superelastic Alloy under Different Temperature-Rate Conditions

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Abstract

Biomedical shape-memory Ti–18Zr–15Nb alloy (at %) was subjected to upsetting with a true strain e = 0.7 in three different regimes: within a temperature range from 20 to 600°C at a deformation rate ξ = 0.1 s–1; at temperatures of 250 and 300°C at deformation rates ξ = 0.1, 1, and 10 s–1; and deformation at a temperature of 300°C and a rate ξ = 0.1 s–1 after annealing at a temperature of 300°C for different times (τ = 10, 60, 300, 600, and 1200 s). It has been established that the conditional yield stress σ0.2 continuously decreases with increasing temperature and, at the same time, the maximum stress σmax is observed to grow within this deformation temperature range of 250–300°C. In the region of temperatures from 200 to 400°C, fluctuations with an amplitude growing with an increase in the temperature are observed in the yield curves. The change in σ0.2 and σmax and the presence of fluctuations in the strain diagrams are produced by dynamic strain aging accompanied by the precipitation of excessive ω-phase particles at temperatures of 200–400°C. An increase in the deformation rate at temperatures of 250–300°C has a strong effect on the deformation behavior of this alloy due to considerable additional deformation-induced heating. Thus, an increase in the deformation rate to ξ = 10 s–1 leads to a jump-like decrease in the stress starting from e ≈ 0.3, afterwards the plastic yield curve takes a wavy shape with a low stress fluctuation frequency. The body-centered cubic (BCC) β-phase is the major phase after all the regimes of thermomechanical tests. Some weak ω-phase lines are observed after annealing at 300°C with exposure for more than 300 s, and essentially broadened ω-phase lines appear for the aged alloy after deformation only with long-term exposure (1200 s).

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ACKNOWLEDGMENTS

The authors are grateful to Akhmadkulov Otabek Bakhtierzhon Ugli for his help in experimental studies.

Funding

This study was founded supported by the Russian Scientific Foundation (project no. 20-63-47063).

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Authors and Affiliations

  1. National University of Science and Technology “Moscow Institute of Steels and Alloys, 119049, Moscow, Russia

    M. A. Derkach, V. A. Sheremetyev, A. V. Korotitskiy & S. D. Prokoshkin

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  1. M. A. Derkach
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  2. V. A. Sheremetyev
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  3. A. V. Korotitskiy
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Translated by E. Glushachenkova

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Derkach, M.A., Sheremetyev, V.A., Korotitskiy, A.V. et al. Study of Low-Temperature Thermomechanical Behavior of the Ti–18Zr–15Nb Superelastic Alloy under Different Temperature-Rate Conditions. Phys. Metals Metallogr. 124, 934–943 (2023). https://doi.org/10.1134/S0031918X23601300

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