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Large low-field magnetocaloric effect in directionally solidified Ni 55 Mn 18+x Ga 27−x (x = 0, 1, 2) alloys

Abstract : The magnetostructural transformation and magnetocaloric effect of directionally solidified polycrystalline Ni55Mn18+xGa27−x (x = 0, 1, 2) alloys were studied. It is shown the directionally solidified alloys form coarse columnar-shaped grains with strong 〈0 0 1〉A (the subscript A refers to austenite) preferred orientation along the solidification direction. Through Mn substitution for Ga, a coupled magnetostructural transformation was realized in Ni55Mn19Ga26 and Ni55Mn20Ga25 alloys. Large adiabatic temperature variation (ΔTad) of 1.47 K and 1.57 K under the low field change of 1.5 T were achieved in these two alloys, respectively. Such ΔTad values are obviously higher than that obtained from a single martensitic transformation and magnetic transition. The present results demonstrate that proper composition tuning to achieve magnetostructural transformation as well as increasing the grain size and preferential orientation degree through directional solidification could be an economical processing route to optimize magnetocaloric properties in polycrystalline Ni-Mn-Ga based alloys.
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https://hal.univ-lorraine.fr/hal-03080304
Contributor : Yudong Zhang <>
Submitted on : Thursday, December 17, 2020 - 4:02:55 PM
Last modification on : Tuesday, March 30, 2021 - 3:12:03 PM

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Zhenzhuang Li, Zongbin Li, Bo Yang, Yiqiao Yang, Y. D. Zhang, et al.. Large low-field magnetocaloric effect in directionally solidified Ni 55 Mn 18+x Ga 27−x (x = 0, 1, 2) alloys. Journal of Magnetism and Magnetic Materials, Elsevier, 2018, 445, pp.71-76. ⟨10.1016/j.jmmm.2017.08.090⟩. ⟨hal-03080304⟩

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