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Influence of Heating and Cooling on the Isothermal β → ω Transition in Ti–22Nb–6Zr Alloy

  • PHYSICAL METALLURGY AND HEAT TREATMENT
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Russian Journal of Non-Ferrous Metals Aims and scope Submit manuscript

Abstract

The influence of heating and cooling routes prior to aging of the Ti–22Nb–6Zr shape memory alloy (at %) on the intensity of formation of the isothermal ωiso phase in the temperature range from 250 to 350°C for 1 and 3 h is studied by X-ray diffraction. It is shown that, for intense formation of the ωiso phase, the most efficient scheme for entering the aging interval includes rapid water cooling water to room temperature from an annealing temperature of 600°C and subsequent rapid heating to an aging temperature of 300°C. All other routes used for entering in the aging interval, including slow cooling and/or heating, do not lead to the formation of an X-ray identifiable amount of the ωiso phase, whereas, the β → ωiso transformation in the temperature range from 250 to 350°C has a pronounced C-shaped kinetics with a maximum at 300°C. Aging in the entire range of 250–350°C leads to the dispersion hardening and an increase in the hardness of the alloy compared to the initial state. Moreover, the hardness gradually increases with an increase in the aging temperature from 250 to 300°C and remains constant in the temperature range of 300–350°C. The β-phase lattice parameter of Ti–22Nb–6Zr alloy remains unchanged over the entire aging temperature range of 250–350°C, which indicates the absence of noticeable diffusional redistribution of elements in the solid solution during the formation of the ωiso phase. The wiso phase formed during the aging of the Ti–22Nb–6Zr alloy over the entire temperature range of 250–350°C has the ratio cω/aω = 0.613 ± 0.002, which is similar to the ratio cω/aω for the shear-type athermal ωath phase, which in turn further emphasizes the identity of these two phase varieties.

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Funding

The present work has been carried out with the financial support of the Russian Science Foundation, project number 21-73-10167, https://rscf.ru/en/project/21-73-10167/ (thermomechanical treatment and hardness measurement) and the Natural Science and Engineering Research Council of Canada (NSERC) (ingot manufacturing).

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Authors and Affiliations

  1. National University of Science and Technology “MISiS”, 119991, Moscow, Russia

    S. M. Dubinskiy & A. P. Baranova

  2. Ecole de Technologie Superieure, QC H3C 1K3, Montreal, Canada

    V. Brailovski

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  1. S. M. Dubinskiy
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  2. A. P. Baranova
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  3. V. Brailovski
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Correspondence to S. M. Dubinskiy.

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Dubinskiy, S.M., Baranova, A.P. & Brailovski, V. Influence of Heating and Cooling on the Isothermal β → ω Transition in Ti–22Nb–6Zr Alloy. Russ. J. Non-ferrous Metals 63, 659–663 (2022). https://doi.org/10.3103/S1067821222060050

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  • DOI: https://doi.org/10.3103/S1067821222060050

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