OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 27 No. 2 2025 Conclusion – Pulsed current-assisted rolling and post-deformation annealing at 450 ℃ alters the direct thermal martensitic transformation pathway upon cooling, from B2 → B19’ to B2 → R → B19’, in both the initially single-phase martensitic (Ti50.0Ni50.0) and austenitic (Ti49.2Ni50.8) alloys in the quenched state. Increasing the strain during pulsed current-assisted rolling expands the temperature range over which the R-phase exists. – A cyclic strain-induced “martensite → austenite → martensite” transformation was detected in the Ti50.0Ni50.0 alloy during pulsed current-assisted rolling. This behavior is attributed to the alternating dominance of deformationmechanisms and the localized thermal influence of the current on the characteristic martensitic transformation temperatures. – The effect of pulsed current-assisted rolling on martensitic transformations in the Ti49.2Ni50.8 alloy is characterized by the absence of strain-induced B19’ martensite and the stabilization of the high-temperature austenitic B2 phase. References 1. Brailovski V., Prokoshkin S., Terriault P., Trochu F. Shape memory alloys: fundamentals, modelling and applications. Montreal, University of Quebec, 2003. 844 p. 2. Tsuchiya K., Ahadi A. Anomalous properties of TiNi processed by severe plastic deformation. Sun Q., Matsui R., Takeda K., Pieczyska E. (eds.). Advances in Shape Memory Materials. Advanced Structured Materials, vol. 73. Cham, Springer, 2017, pp. 191–201. DOI: 10.1007/978-3-319-53306-3_14. 3. Andreev V.A., Karelin R.D., Komarov V.S., Cherkasov V.V., Dormidontov N.A., Laisheva N.V., Yusupov V.S. Influence of rotary forging and post-deformation annealing on mechanical and functional properties of titanium nickelide. Metallurgist, 2024, vol. 67, pp. 1912–1919. DOI: 10.1007/s11015-024-01688-4. 4. Shuitcev A.V., Ren Y., Gunderov D.V., Vasin R.N., Li L., Valiev R.Z., Zheng Y.F., Tong Y.X. Grain growth in Ni50Ti30Hf20 high-temperature shape memory alloy processed by high-pressure torsion. Materials Science and Engineering: A, 2024, vol. 918, p. 147478. DOI: 10.1016/j.msea.2024.147478. 5. Andreev V.A., Yusupov V.S., Perkas M.M., Yakushevich N.V. Goryachaya rotatsionnaya kovka prutkov diametrom 2–20 mm iz splavov s pamyat’yu formy na osnove nikelida titana [Hot rotary forging of bars with a diameter of 2–20 mm from shape memory alloys based on titanium nickelide]. Perspektivnye materialy i tekhnologii. V 2 t. T. 1 [Promising materials and technologies. In 2 vol. Vol. 1]. Vitebsk, Vitebsk State Technological University Publ., 2017, pp. 61–69. 6. Andreev V.A., Karelin R.D., Komarov V.S. Cherkasov V.V., Dormidontov N.A., Laisheva N.V., Yusupov V.S. Vliyanie rezhimov rotatsionnoi kovki i posledeformatsionnoi termicheskoi obrabotki na mekhanicheskie i funktsional’nye svoistva nikelida titana [Influence of rotary forging and post-deformation heat treatment on mechanical and functional properties of titanium nickelide]. Metallurg = Metallurgist, 2023, no. 12, pp. 87–92. DOI: 10.52351/00260827_2023_12_87. (In Russian). 7. LotkovA.I., GrishkovV.N., BaturinA.A., Dudarev E.F., ZhapovaD.Yu., TimkinV.N. Vliyanie teploi deformatsii metodom abc-pressovaniya na mekhanicheskie svoistva nikelida titana [The effect of warm deformation by abcpressing method on mechanical properties of titanium nickelide]. Pis’ma o materialakh = Letters on Materials, 2015, vol. 5 (2), pp. 170–174. DOI: 10.22226/2410-3535-2015-2-170–174. (In Russian). 8. Fedotkin A.A., Stolyarov V.V. Osobennosti deformatsionnogo povedeniya nanostrukturnykh titanovykh splavov pri rastyazhenii pod deistviem impul’snogo toka [Features of the deformation behavior of nanostructured titanium alloys under tension under the action of pulsed current]. Mashinostroenie i inzhenernoe obrazovanie = Mechanical Engineering and Engineering Education, 2012, no. 1 (30), pp. 28–35. 9. Misochenko A.A., Fedotkin A.A., Stolyarov V.V. Influence of grain size and electric current regimes on deformation behavior under tension of shape memory alloy TI49,3NI50,7. Materials Today: Proceedings, 2017, vol. 4 (3), pp. 4753–4757. DOI: 10.1016/j.matpr.2017.04.065. 10. Stolyarov V.V. Elektroplasticheskii effekt v krupnozernistom i ul’tramelkozernistom titane [The electroplastic effect in coarse-grained and ultrafine-grained titanium]. Zavodskaya laboratoriya. Diagnostika materialov = Industrial laboratory. Diagnostics of materials, 2023, vol. 89 (8), pp. 62–66. DOI: 10.26896/1028-6861-2023-89-862-66. (In Russian).
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