Evolution of core-shell structure induced by Yttrium in Nd-LaCe-Fe-B multi-main-phase magnets

•The La/Ce elements are trapped in the RE2Fe14B shell by the inducement of Y.•LaCe-substituted MMP magnets have dual-type shell morphologies.•LaCeY-substituted MMP magnets have one-type shell structure.•The synergistic effect of Y and LaCe in MMP magnets is analysed. [Display omitted] The effects of...

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Published inJournal of alloys and compounds Vol. 896; p. 163127
Main Authors Fan, Sining, Wang, Zhixiang, Jin, Zhehuan, Ding, Guangfei, Fan, Xiaodong, Cao, Shuai, Guo, Shuai, Zheng, Bo, Chen, Renjie, Yan, Aru, Meng, Bin
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 10.03.2022
Elsevier BV
Subjects
Anisotropy
Cerium
Coercivity
Core-shell structure
Grain boundaries
High-abundance rare-earth element
Lace
Lanthanum
Magnetic anisotropy
Magnetic properties
Magnets
Microstructure
Nd-Fe-B magnets
Neodymium
Shells
Substitutes
Yttrium
Core-shell structure
High-abundance rare-earth element
Microstructure
Nd-Fe-B magnets
Magnetic anisotropy
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Summary:•The La/Ce elements are trapped in the RE2Fe14B shell by the inducement of Y.•LaCe-substituted MMP magnets have dual-type shell morphologies.•LaCeY-substituted MMP magnets have one-type shell structure.•The synergistic effect of Y and LaCe in MMP magnets is analysed. [Display omitted] The effects of Y and LaCe substitution in Nd-Fe-B multi-main-phase (MMP) magnets were investigated by co-mixing with the binary or ternary components. The microstructure and magnetic properties showed some differences after Y and LaCe-substitution. The coercivity was increased for the LaCe-substituted MMP magnets with two-types shell structures due to the stronger magnetic isolation between adjacent grains. Y-substituted MMP magnets with one-type shell structure exhibited a relatively lower coercivity due to the deterioration of anisotropy owing to the La/Ce/Y enrichment in the core-shell structure. The La element preferred to migrate to the grain boundary regions in the LaCe-substituted MMP magnets, while it was trapped in the 2:14:1 shell by the inducement of Y in the Y-substituted MMP magnets. This work provides new insights into the fabrication of La/Ce/Y magnets with high performance.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2021.163127