The temperature dependence of the elastocaloric effect is studied and the experimental values of the adiabatic temperature change, ΔTad, in the loading/unloading cycles of up to 13.3 K and 16.4 K in quenched and aged Ni50.6Ti49.4 single crystals at 573 K, 1 h, respectively, are obtained. In aged crystals, a specific feature of the elastocaloric effect temperature dependence (an increase in ΔTad above the temperature TR = 273 K) is found, which is due to a change in the sequence of stress-induced martensitic transformation from R–B19′ to B2–B19′. The factors (the dissipated energy in the working cycle and the strain hardening coefficient during the stress-induced martensitic transformation) affecting the elastocaloric effect are discussed. It is shown that the aged single crystals have a high coefficient of performance (COP of up to 31), which is promising for the solid-state cooling technologies.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 114–119, September, 2021.
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Surikov, N.Y., Panchenko, E.Y. & Chumlyakov, Y.I. The Elastocaloric Effect in [001]-Single Crystals of Titanium Nickelide Containing Nanosized Ti3Ni4 Particles. Russ Phys J 64, 1708–1714 (2022). https://doi.org/10.1007/s11182-022-02511-w
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DOI: https://doi.org/10.1007/s11182-022-02511-w