Magnetocaloric Effect in a Ni2.25Mn0.75Ga0.93Si0.07 Alloy
- Autores: Gaifullin R.1, Gadzhiev A.2, Aliev A.2, Taskaev S.3, Musabirov I.1
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Afiliações:
- Institute for Metals Superplasticity Problems, Russian Academy of Sciences
- Institute of Physics, Russian Academy of Sciences
- Chelyabinsk State University
- Edição: Volume 68, Nº 4 (2023)
- Páginas: 346-352
- Seção: К 90-ЛЕТИЮ ВЛАДИМИРА ГРИГОРЬЕВИЧА ШАВРОВА
- URL: https://journals.rcsi.science/0033-8494/article/view/138188
- DOI: https://doi.org/10.31857/S0033849423040022
- EDN: https://elibrary.ru/PEOGAI
- ID: 138188
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Resumo
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.
Sobre autores
R. Gaifullin
Institute for Metals Superplasticity Problems, Russian Academy of Sciences
Email: irekmusabirov@mail.ru
Ufa, 450001 Russia
A. Gadzhiev
Institute of Physics, Russian Academy of Sciences
Email: irekmusabirov@mail.ru
Makhachkala, 367003 Russia
A. Aliev
Institute of Physics, Russian Academy of Sciences
Email: irekmusabirov@mail.ru
Makhachkala, 367003 Russia
S. Taskaev
Chelyabinsk State University
Email: irekmusabirov@mail.ru
Chelyabinsk, 454001 Russia
I, Musabirov
Institute for Metals Superplasticity Problems, Russian Academy of Sciences
Autor responsável pela correspondência
Email: irekmusabirov@mail.ru
Ufa, 450001 Russia
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