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Effect of the quasi-continuous equal-channel angular pressing on the structure and functional properties of Ti–Ni-based shape-memory alloys

  • Structure, Phase Transformations, and Diffusion
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Abstract

The effect of severe plastic deformation by equal-channel angular pressing (ECAP) under normal and quasi-continuous regimes on the structure and the mechanical and functional properties of a Ti–50.2 at % Ni shape-memory alloy (SMA) has been studied. ECAP was carried out at an angle of intersection of channels of 120° in the normal regime with heating between passes at 450°C for 20 passes and in the quasi-continuous regime at the temperature of 400°C for three, five, and seven passes. The hot screw rolling with subsequent annealing at 750°C for 30 min and cooling in water was used as a control treatment (CT). A mixed submicrocrystalline and nanosubgrained structure was formed. The increase in the number of passes from three to seven led to a decrease in the average size of structural elements from 115 ± 5 to 103 ± 5 nm and to an increase in the fraction of grains/subgrains having a size less than 100 nm. After ECAP (seven passes) and post-deformation annealing at the temperature of 400°C for 1 h, a completely recoverable strain was 9.5%; after normal ECAP, 7.2%; after CT, 4.0%.

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Authors and Affiliations

  1. National University of Science and Technology MISiS, Leninskii pr. 4, Moscow, 119049, Russia

    I. Yu. Khmelevskaya, R. D. Karelin, S. D. Prokoshkin & V. S. Komarov

  2. Matek-Sma Ltd, ul. Kar’er 2a, Moscow, 117449, Russia

    V. A. Andreev

  3. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninskii pr. 49, Moscow, 119991, Russia

    R. D. Karelin, V. S. Yusupov, M. M. Perkas, V. V. Prosvirnin & A. E. Shelest

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  1. I. Yu. Khmelevskaya
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  2. R. D. Karelin
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  3. S. D. Prokoshkin
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  4. V. A. Andreev
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  5. V. S. Yusupov
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  6. M. M. Perkas
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  9. V. S. Komarov
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Correspondence to I. Yu. Khmelevskaya.

Additional information

Original Russian Text © I.Yu. Khmelevskaya, R.D. Karelin, S.D. Prokoshkin, V.A. Andreev, V.S. Yusupov, M.M. Perkas, V.V. Prosvirnin, A.E. Shelest, V.S. Komarov, 2017, published in Fizika Metallov i Metallovedenie, 2017, Vol. 118, No. 3, pp. 293–300.

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Khmelevskaya, I.Y., Karelin, R.D., Prokoshkin, S.D. et al. Effect of the quasi-continuous equal-channel angular pressing on the structure and functional properties of Ti–Ni-based shape-memory alloys. Phys. Metals Metallogr. 118, 279–287 (2017). https://doi.org/10.1134/S0031918X17030073

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  • DOI: https://doi.org/10.1134/S0031918X17030073

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