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EVOLUTION OF STRUCTURE AND PROPERTIES OF NICKEL-ENRICHED TI-NI SHAPE MEMORY ALLOY SUBJECTED TO COMPRESSIVE DEFORMATION

1,2,3 KOMAROV Victor
Co-authors:
2 KHMELEVSKAYA Irina 1,2 KARELIN Roman 1 YUSUPOV Vladimir 2 POSTNIKOV Ivan 3 KORPALA Grzegorz 3 KAWALLA Rudolf 3 PRAHL Ulrich 1 PROKOSHKIN Sergey
Institutions:
1 Baikov Institute of Metallurgy and Materials Science, RAS, Moscow, Russia, vickomarov@gmail.com
2 National University of Science and Technology MISIS, Moscow, Russia, khmel@tmo.misis.ru
3 TU Bergakademie Freiberg, Germany, grzegorz.korpala@imf.tu-freiberg.de
Conference:
29th International Conference on Metallurgy and Materials, Brno, Czech Republic, EU, May 20 - 22, 2020
Proceedings:
Proceedings 29th International Conference on Metallurgy and Materials
Pages:
1187-1192
ISBN:
978-80-87294-97-0
ISSN:
2694-9296
DOI:
https://doi.org/10.37904/metal.2020.3623
Published:
27th July 2020
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
702 views / 439 downloads
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Abstract

The effect of compressive deformation of the nickel-enriched Ti-Ni shape memory alloy in a temperature range of 100 to 900 °С on phase composition, microstructure, mechanical and functional properties was studied. The temperature ranges of dynamic recovery, polygonization and recrystallization were determined as a result of comparative optical microscopy, XRD, DSC studies, HV measurements and shape recovery testing. Lowering of the compressive deformation temperature is accompanied by an increase in a hardness value from 280 to 350 HV and leads to decrease in average grain size from 33 to 16 μm. The dispersion hardening leads to an increase in shape recovery properties. The optimum deformation temperature range for thermomechanical treatment of Ti-Ni SMA from the viewpoint of ultrafine-grained structure and high functional properties formation was determined as 400 to 600 °C.

Keywords: Shape memory alloys, Ti-Ni, thermomechanical treatment, structure parameters

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