(163127)Evolution of core-shell structure induced by Yttrium in Nd-LaCe-Fe-B multi-main-phase magnets
Sining Fan 1Zhixiang Wang 2Zhehuan Jin2
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作者信息
1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan Province, PR China
2. CAS Key Laboratory of Magnetic Materiab and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China
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Abstract
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.
NSTL
Elsevier