Solid-state refrigeration has emerged as the most promising alternative to conventional refrigeration technology. However, for this technology to be applicable, the caloric effects produced in the alloys must be highly reversible. In this context, we compare the elastocaloric effect of two Ni–Mn–Ga alloys with different types of modulated martensite. The elastocaloric effect, quantified as the isothermal entropy change (ΔSela), was investigated in Ni50Mn28Ga22 and Ni50Mn30Ga20 alloys with 5M and 7M modulated martensite, respectively. Maximum ΔSela values obtained were 1.91 J kg−1 K−1 during cooling and 1.83 J kg−1 K−1 during heating in martensite 5M and 0.19 J kg−1 K−1 during cooling and 0.26 J kg−1 K−1 during heating in martensite 7M, for a constant applied stress of 10 MPa. However, although the 7M modulated martensite exhibited a lower ΔSela, its reversibility was higher. Therefore, our results could be useful for selecting a good material to be used in solid-state refrigeration.
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28 October 2024
Research Article|
October 31 2024
A point of view of the elastocaloric effect associated with 7M and 5M modulated martensite in Ni–Mn–Ga alloys
M. López-Medina
;
M. López-Medina
a)
(Conceptualization, Formal analysis, Investigation, Methodology, Writing – original draft, Writing – review & editing)
1
Instituto Potosino de Investigación Científica y Tecnológica A. C
., Camino a la Presa San José 2055, Col. Lomas 4a sección, C.P. 78216 San Luis Potosí, S. L. P., Mexico
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H. Flores-Zúñiga
;
H. Flores-Zúñiga
(Conceptualization, Funding acquisition, Resources, Supervision, Writing – review & editing)
1
Instituto Potosino de Investigación Científica y Tecnológica A. C
., Camino a la Presa San José 2055, Col. Lomas 4a sección, C.P. 78216 San Luis Potosí, S. L. P., Mexico
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D. E. Soto-Parra
;
D. E. Soto-Parra
(Conceptualization, Formal analysis, Writing – review & editing)
2
Tecnológico Nacional de México/Instituto Tecnológico de Delicias
, Paseo Tecnológico Km 3.5, Norte 3, C.P. 33000 Cd. Delicias, Chihuahua, Mexico
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D. Ríos-Jara
D. Ríos-Jara
(Funding acquisition, Writing – review & editing)
1
Instituto Potosino de Investigación Científica y Tecnológica A. C
., Camino a la Presa San José 2055, Col. Lomas 4a sección, C.P. 78216 San Luis Potosí, S. L. P., Mexico
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Appl. Phys. Lett. 125, 181905 (2024)
Article history
Received:
August 30 2024
Accepted:
October 22 2024
Citation
M. López-Medina, H. Flores-Zúñiga, D. E. Soto-Parra, D. Ríos-Jara; A point of view of the elastocaloric effect associated with 7M and 5M modulated martensite in Ni–Mn–Ga alloys. Appl. Phys. Lett. 28 October 2024; 125 (18): 181905. https://doi.org/10.1063/5.0236129
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