Magnetocaloric Effect in a Ni2.25Mn0.75Ga0.93Si0.07 Alloy

R. Yu. Gaifullin; Гайфуллин Р. Ю.; A. B. Gadzhiev; Гаджиев А. Б.; A. M. Aliev; Алиев А. М.; S. V. Taskaev; Таскаев С. В.; I, I. Musabirov; Мусабиров И. И.

doi:10.31857/S0033849423040022

Magnetocaloric Effect in a Ni2.25Mn0.75Ga0.93Si0.07 Alloy

Authors: Gaifullin R.Y.¹, Gadzhiev A.B.², Aliev A.M.², Taskaev S.V.³, Musabirov I.I.¹
Affiliations:
1. Institute for Metals Superplasticity Problems, Russian Academy of Sciences
2. Institute of Physics, Russian Academy of Sciences
3. Chelyabinsk State University
Issue: Vol 68, No 4 (2023)
Pages: 346-352
Section: К 90-ЛЕТИЮ ВЛАДИМИРА ГРИГОРЬЕВИЧА ШАВРОВА
URL: https://ruspoj.com/0033-8494/article/view/650541
DOI: https://doi.org/10.31857/S0033849423040022
EDN: https://elibrary.ru/PEOGAI
ID: 650541

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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.

Keywords

magnetocaloric effect, multi-axial isothermal forging, magnetic phase transformations

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