Abstract
The results of a study of the magnetocaloric effect (MCE) in Ni2.25Mn0.75Ga0.93Si0.07 alloy are presented in the cast state and in the state after multi-axial isothermal forging (MIF) at 700°C and true degree of deformation e = 3.19. It is shown that as a result of MIF, the initial equiaxed microstructure is transformed into a bimodal one in which large grains 100–200 µm in size are surrounded by a layer of fine-grained microstructure. As a result of MIF, the range of martensitic transformation is slightly shifted to the region of low temperatures by about 5°C. The analysis of phase transformations in the region of room temperatures shows that the intervals of martensitic and magnetic phase transformations are superimposed on each other. The MCE value in a magnetic field of 1.8 T is 0.59ºC in the initial cast state, and as a result of forging it decreases to 0.55°C.
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The study was supported by the state task of the Institute for Metals Superplasticity Problems, Russian Academy of Sciences. The studies were carried out on the basis of the Center for Collective Use of Scientific Equipment of the Institute for Metals Superplasticity Problems, Russian Academy of Sciences, “Structural and Physicomechanical Studies of Materials.”
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Gaifullin, R.Y., Gadzhiev, A.B., Aliev, A.M. et al. Magnetocaloric Effect in a Ni2.25Mn0.75Ga0.93Si0.07 Alloy. J. Commun. Technol. Electron. 68, 407–412 (2023). https://doi.org/10.1134/S1064226923040022
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DOI: https://doi.org/10.1134/S1064226923040022