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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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