Microstructural evolution and magnetocaloric properties of cold plastically deformed La0.6Pr0.4Fe10.7Co0.8Si1.5 alloy

Xu YANG; Bin FU; Jie HAN; Lianqi ZHANG

doi:10.11868/j.issn.1001-4381.2023.000338

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Journal of Materials Engineering ›› 2023, Vol. 51 ›› Issue (11) : 189-196. DOI: 10.11868/j.issn.1001-4381.2023.000338

Microstructural evolution and magnetocaloric properties of cold plastically deformed La_0.6Pr_0.4Fe_10.7Co_0.8Si_1.5 alloy

Xu YANG ¹ ,
Bin FU ¹ ,
Jie HAN ² ,
Lianqi ZHANG ¹

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Abstract

In order to improve the preparation process and practical process of magnetic refrigerant， a method of accelerating phase formation by cold compression plastic deformation at room temperature was proposed. The grain structure， phase composition and magneto-thermal effects of La_0.6Pr_0.4Fe_10.7Co_0.8Si_1.5 alloy were systematically studied. The results show that with the increase of compression ratio， the number of grains per unit area increases and the grain size is uniform. Compared with the uncompressed sample， the proportion of magnetothermal phase increases after annealing under the same conditions. When the compression rate is 30%， the ratio of 1∶13 phase after 3 days annealing is 92.68%（volume fraction）， and the pre deformed sample is obviously better than the undeformed sample.After annealing for 3 days， the Curie temperature （T _C） of 30% pre-deformed La_0.6Pr_0.4Fe_10.7Co_0.8Si_1.5 is 289 K， and the magnetic entropy change （ΔS _max） is -7.1 J/（kg·K） under 2 T magnetic fields.The suitable Curie temperature and value of ΔS _max make it an attractive potential candidate for the room temperature magnetic refrigeration application.

Key words

plastic deformation / 1∶13 phase / magnetocaloric effect / La（Fe，Si）₁₃ alloy

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Xu YANG , Bin FU , Jie HAN , et al. Microstructural evolution and magnetocaloric properties of cold plastically deformed La_0.6Pr_0.4Fe_10.7Co_0.8Si_1.5 alloy[J]. Journal of Materials Engineering. 2023, 51(11): 189-196 https://doi.org/10.11868/j.issn.1001-4381.2023.000338

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