Abstract
This paper presents a study of the metamagnetostructural transition of the martensitic type in the Ni46Mn41In13 alloy with magnetic shape memory and inverse magnetocaloric effect. Differential scanning calorimetry was used to determine the characteristic temperatures of the direct transformation (start at Ms = 253 K, finish at Mf = 164 K) and the reverse transformation (As = 203 K and Af = 236 K, respectively). The characteristic features of the transformation, that is, a decrease in the temperature of the onset of the direct transformation and the presence of a residual austenite phase, and premartensite states, were studied using transmission electron microscopy. The estimated thickness of the material at which the martensitic transformation is suppressed is 50 nm.
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ACKNOWLEDGMENTS
Electron microscopic studies and the preparation of foils for TEM were carried out at the Interdisciplinary Resource Center “Nanotechnology,” Collective Use Center of the Research Park, St. Petersburg State University.
Funding
The study was supported by the Russian Science Foundation (project no. 20-79-10197).
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Translated by O. Zhukova
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Kuznetsov, D.D., Kuznetsova, E.I., Mashirov, A.V. et al. In Situ TEM Study of Phase Transformations in Nonstoichiometric Ni46Mn41In13 Heusler Alloy. Phys. Solid State 64, 15–21 (2022). https://doi.org/10.1134/S1063783422010115
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DOI: https://doi.org/10.1134/S1063783422010115