Journal of Radio Electronics. eISSN 1684-1719. 2025. №12

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DOI: https://doi.org/10.30898/1684-1719.2025.12.5

MANIFESTATION OF TWO-WAY SHAPE MEMORY EFFECT
IN RAPIDLY QUENCHED LAYERED
AMORPHOUS-CRYSTALLINE STRUCTURAL COMPOSITES
OF Ti₅₀Ni₂₅Cu₂₅ ALLOY

Sitnikov N.N.^1,2, Greshnyakova S.V.¹, Zaletova I.A.¹, Shelyakov A.V.²

¹State Scientific Center of the Russian Federation «Keldysh Research Center»,
125438, Russia, Moscow, Onezhskaya str., 8

²National Research Nuclear University «MEPhI»,
115409, Russia, Moscow, Kashirskoe shosse, 31

The paper was received November 19, 2025.

Abstract. Layered amorphous-crystalline structural composites made of Ti₅₀Ni₂₅Cu₂₅ alloy with different ratios of amorphous and crystalline phases were obtained by quenching from a melt in the form of extended ribbons. In such composites, when thermocycling in the intervals of martensitic transformations, the two-way shape memory effect (TWSME) with bending deformation is realized without additional thermomechanical treatment. It was found that an increase in the thickness ratio of the crystalline and amorphous layers leads to an increase in the bending curvature of the ribbon during the implementation of TWSME, the maximum achieved curvature of the ribbon 0,16 mm^-1 corresponds to a layer ratio of 0,34. Comprehensive studies of the structure and thermomechanical properties of the obtained rapidly quenched layered amorphous-crystalline ribbons have been carried out. Cross-sectional studies have revealed a sharp boundary between the amorphous and crystalline layers, and have also shown that the crystalline layer has a columnar structure. It has been established that the shape change of a layered amorphous-crystalline composite occurs due to the martensitic transformation of B2↔B19 in the crystalline layer and the accompanying shape memory effect, as a result of which the crystalline layer is reduced. A model for the formation of a rapidly quenched layered amorphous-crystalline structural composite and the implementation of TWSME during its thermal cycling in the range of martensitic transformations is proposed.

Key words: shape memory effect, rapid quenched, amorphous state, crystalline state, TiNiCu.

Financing: The research was carried out at the expense of the Russian Science Foundation grant project No. 24-22-00035 (https://rscf.ru/project/24-22-00035/).

Corresponding author: Sitnikov Nikolay Nikolaevich, sitnikov_nikolay@mail.ru

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For citation:

Sitnikov N.N., Greshnyakova S.V., Zaletova I.A., Shelyakov A.V. Manifestation of two-way shape memory effect in rapidly quenched layered amorphous-crystalline structural composites of Ti₅₀Ni₂₅Cu₂₅ alloy. // Journal of Radio Electronics. – 2025. – №. 12. https://doi.org/10.30898/1684-1719.2025.12.5 (In Russian).