Comprehensive performance of a ball-milled La0.5Pr0.5Fe11.4Si1.6B0.2Hy/Al magnetocaloric composite

doi:10.1088/1674-1056/ac280b

Abstract Due to the hydrogen embrittlement effect, La(Fe,Si)₁₃-based hydrides can only exist in powder form, which limits their practical application. In this work, ductile and thermally conductive Al metal was homogeneously mixed with La_0.5Pr_0.5Fe_11.4Si_1.6B_0.2 using the ball milling method. Then hydrogenation and compactness shaping of the magnetocaloric composites were performed in one step via a sintering process under high hydrogen pressure. As the Al content reached 9 wt.%, the La_0.5Pr_0.5Fe_11.4Si_1.6B_0.2H_y/Al composite showed the mechanical behavior of a ductile material with a yield strength of ~44 MPa and an ultimate strength of 269 MPa accompanied by a pronounced improvement in thermal conductivity. Due to the ease of formation of Fe-Al-Si phases and the several micron and submicron sizes of the composite particles caused by ball milling process, the magnetic entropy change of the composites was substantially reduced to ~1.2 J/kg· K-1.5 J/kg· K at 0 T-1.5 T.

Keywords: ball milling mechanical behavior room-temperature magnetic refrigeration La(Fe,Si)₁₃

Received: 15 August 2021
Revised: 13 September 2021
Accepted manuscript online: 18 September 2021

PACS:	75.30.Sg	(Magnetocaloric effect, magnetic cooling)
	62.20.-x	(Mechanical properties of solids)

Fund: Project supported by the Open Research Project of State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization and the National Natural Science Foundation of China (Grant Nos. 51771197 and 52171187).

Corresponding Authors: Nai-Kun Sun, Xin-Guo Zhao
E-mail: naikunsun@163.com;xgzhao@imr.ac.cn

Cite this article:

Jiao-Hong Huang(黄焦宏), Ying-De Zhang(张英德), Nai-Kun Sun(孙乃坤), Yang Zhang(张扬), Xin-Guo Zhao(赵新国), and Zhi-Dong Zhang(张志东) Comprehensive performance of a ball-milled La_0.5Pr_0.5Fe_11.4Si_1.6B_0.2H_y/Al magnetocaloric composite 2022 Chin. Phys. B 31 047503

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Comprehensive performance of a ball-milled La0.5Pr0.5Fe11.4Si1.6B0.2Hy/Al magnetocaloric composite

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Comprehensive performance of a ball-milled La_0.5Pr_0.5Fe_11.4Si_1.6B_0.2H_y/Al magnetocaloric composite