Composition adjustment and hydrostatic pressure control of magnetocaloric effect in Ni-Mn-Ga alloys

被引：0
作者：
Hu F.-E. [1 ,2 ]
Cao Y.-M. [1 ]
Wei S.-X. [1 ]
Tao C. [1 ,3 ]
He X.-J. [1 ]
Kang Y.-R. [1 ]
Li Z. [1 ]
机构：
[1] Center for Magnetic Materials and Devices, Qujing Normal University, Qujing
[2] College of Chemistry and Environmental Science, Qujing Normal University, Qujing
[3] College of Physics and Electronic Engineering, Qujing Normal University, Qujing
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2019年 / 29卷 / 12期
基金：
中国国家自然科学基金;
关键词：
Hydrostatic pressure; Magnetic refrigeration; Magnetocaloric effect; Martensitic transformation; Ni-Mn-Ga alloy;
D O I：
10.19476/j.ysxb.1004.0609.2019.12.12
中图分类号：
学科分类号：
摘要：
The optimization, regulation and control of magnetocaloric effect (MCE) in Ni-Mn-Ga alloys are one of the main research hotspots in refrigeration engineering. In order to optimize the MCE of Ni-Mn-Ga alloys, the phase transformation properties and the effects of composition and hydrostatic pressure on MCE in Ni54+xMn19-xGa27 (x=0.0, 0.4, 1.0) were experimentally studied and discussed. The results from heat flow data and magnetic measurements show that the martensitic transformation (MT) temperatures gradually increase with increasing the Ni content. However, the Curie temperatures first decrease and then increase with increasing Ni content. Importantly, a first-order coupled magnetic-structural transformation (MST), i.e., a simultaneous occurrence of the first-order MT and of the second-order magnetic transition, is observed in Ni-Mn-Ga alloys with x=1.0. Besides, absolute value of the maximum magnetic entropy changes (|ΔSM|max) and refrigeration capacity (WRC) increases with the Ni content increase under the same magnetic field change. Furthermore, |ΔSM|max and WRC are as large as 8.2 J/(kg•K) and 53.61 J/kg for the alloy with x=1.0 under a magnetic field change of 3 T. Such values in |ΔSM|max are approximately 3.04 and 2.28 times of those of alloys with x of 0 and 0.4, respectively. Meanwhile, the amplitude of WRC for x=1.0 are about 3.31 and 1.67 times of those of alloys with x of 0 and 0.4, respectively. Much importantly, the hydrostatic pressure of 0.58 GPa has a marginal effect on |ΔSM|max in the alloy with x=1.0 while WRC is enhanced by 43.82% resulting from the application of hydrostatic pressure to broaden the temperature window of phase transformation. For the sake of comparison and engineering application, the dependence of the external magnetic field on |ΔSM|max and WRC is obtained by using the linear fitting method. These relationships can be used to rapidly estimate |ΔSM|max and WRC in Ni54+xMn19-xGa27 (x=0.0, 0.4, 1.0) alloys under various magnetic fields. The results are very meaningful for the optimization, adjustment and control and engineering application of magnetocaloric effect in Ni-Mn-Ga alloys. © 2019, Science Press. All right reserved.
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页码：2793 / 2801
页数：8
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