"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 12, 2019

contents of issue      DOI  10.30898/1684-1719.2019.12.16   full text in Russian (pdf)  

UDC 621.391, 621.396

Thermomechanical properties of microwires from Ni49.9Ti50.1 alloy made of rods processed by warm forging and a combination of ECAP and warm forging

 

V. S. Kalashnikov 1, V. A. Andreev 2.6, V. V. Koledov 1,4, D. V. Gunderov 3.5, V. G. Shavrov 1, D. V. Kuchin 1, A. V. Petrov 1, M. S. Bybik 1, A. V. Nesolenov 1

 

1 Kotelnikov Institute of Radioengineering and Electronics of Russian Academy of Sciences, Mokhovaya str., 11-7, Moscow 125009, Russia

2 Matek-Sma Ltd , Karier st., 2A-1, Moscow 117499, Russia

3 Institute of Physics of Molecules and Crystals of Russian Academy of Sciences, pr. Octyabrya, 71, Ufa 450054, Russia

4 ISC"NANO-DENT", Kasatkina St., 3, Moscow 129301, Russia

5 St. Petersburg State University, Universitetskaya prom., 7/9, St. Petersburg 199034, Russia.

6 Institute of Metallurgy and Materials Science RAS, Leninsky Prospect, 49, Moscow119334, Russia

 

The paper is received on December 13, 2019

 

Abstract. The influence of the initial state of a bar of Ni49.9Ti50.1 shape memory alloy on the characteristics of thermoelastic martensitic transformation in microwires obtained by cold and warm drawing with a diameter of 100 μm was studied. It was demonstrated that the recoverable deformation for a wire from a bar after warm forging and annealed at 350 C was 12% at the load of 805 MPa (energy capacity was 96 MJ / m3), and in a wire from a bar processed by ECAP operation and warm forging annealed at 400˚ C recoverable deformation was 7.2% at 846 MPa (energy capacity was 61 MJ / m3). It was noted that increasing the annealing temperature to 450C and the exposure time to 45-60 minutes slightly increase the level of functional properties in 1.5-2 times and low annealing temperatures and short exposure times significantly increase the functional properties in 3-9 times in regard to initial state.

Key words: phase transitions, shape memory effect, thermoelastic martensitic transformation.

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For citation:

Kalashnikov V.S., Andreev V.A., Koledov V.V., Gunderov D.V., Shavrov V.G., Kuchin D.V., Petrov A.V., Bybik M.S., Nesolenov A.V. Thermomechanical properties of microwires from Ni49.9Ti50.1 alloy made of rods processed by warm forging and a combination of ECAP and warm forging. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2019. No. 12. Available at http://jre.cplire.ru/jre/dec19/16/text.pdf
DOI  10.30898/1684-1719.2019.12.1
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