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 450°C 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 10.30898/1684-1719.2019.12.16