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Structure and Properties of Ti-19.7Nb-5.8Ta Shape Memory Alloy Subjected to Thermomechanical Processing Including Aging

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Abstract

In this work, the ternary Ti-19.7Nb-5.8Ta (at.%) alloy for biomedical applications was studied. The ingot was manufactured by vacuum arc melting with a consumable electrode and then subjected to hot forging. Specimens were cut from the ingot and processed by cold rolling with e = 0.37 of logarithmic thickness reduction and post-deformation annealing (PDA) between 400 and 750 °C (1 h). Selected samples were subjected to aging at 300 °C (10 min to 3 h). The influence of the thermomechanical processing on the alloy’s structure, phase composition, and mechanical and functional properties was studied. It was shown that thermomechanical processing leads to the formation of a nanosubgrained structure (polygonized with subgrains below 100 nm) in the 500-600 °C PDA range, which transforms to a recrystallized structure of β-phase when PDA temperature increases. Simultaneously, the phase composition and the β → α″ transformation kinetics vary. It was found that after conventional cold rolling and PDA, Ti-Nb-Ta alloy manifests superelastic and shape memory behaviors. During aging at 300 °C (1 h), an important quantity of randomly scattered equiaxed ω-precipitates forms, which results in improved superelastic cyclic properties. On the other hand, aging at 300 °C (3 h) changes the ω-precipitates’ particle morphology from equiaxed to elongated and leads to their coarsening, which negatively affects the superelastic and shape memory functional properties of Ti-Nb-Ta alloy.

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Acknowledgments

The present work was carried out with the financial support of the Natural Science and Engineering Research Council of Canada and of the Ministry of Education and Science of the Russian Federation.

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Authors and Affiliations

  1. École de technologie supérieure, 1100, Notre-Dame Street West, Montreal, QC, H3C 1K3, Canada

    S. Dubinskiy, Vladimir Brailovski & K. Inaekyan

  2. National University of Science and Technology “MISIS”, 4, Leninsky prosp., Moscow, 119049, Russian Federation

    S. Dubinskiy, S. Prokoshkin, V. Sheremetyev, M. Petrzhik & M. Filonov

  3. Institute of the Metals Physics, Ural Branch of the Russian Academy of Sciences, 18, Sofia Kovalevskaya Street, Ekaterinburg, 620990, Russian Federation

    V. Pushin

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  1. S. Dubinskiy
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  2. Vladimir Brailovski
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  3. S. Prokoshkin
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  4. V. Pushin
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  5. K. Inaekyan
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  7. M. Petrzhik
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  8. M. Filonov
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Correspondence to Vladimir Brailovski.

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Dubinskiy, S., Brailovski, V., Prokoshkin, S. et al. Structure and Properties of Ti-19.7Nb-5.8Ta Shape Memory Alloy Subjected to Thermomechanical Processing Including Aging. J. of Materi Eng and Perform 22, 2656–2664 (2013). https://doi.org/10.1007/s11665-013-0555-6

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  • DOI: https://doi.org/10.1007/s11665-013-0555-6

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