Microstructure evolution and metallurgical behavior of (Y/RE)2Fe14B sintered magnets (RE = Nd, Tb)

Mingpeng Kou; Zhi Jia; Guangfei Ding; Shuai Cao; Xintong Yang; Yuhao Li; Xiaodong Fan; Bo Zheng; Renjie Chen; Shuai Guo; Aru Yan

Results in Physics (May 2023)

Microstructure evolution and metallurgical behavior of (Y/RE)2Fe14B sintered magnets (RE = Nd, Tb)

Mingpeng Kou,
Zhi Jia,
Guangfei Ding,
Shuai Cao,
Xintong Yang,
Yuhao Li,
Xiaodong Fan,
Bo Zheng,
Renjie Chen,
Shuai Guo,
Aru Yan

Affiliations

Mingpeng Kou: CISRI & NIMTE Joint Innovation Center for Rare Earth Permanent Magnets, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; University of Chinese Academy of Sciences, Beijing 100049, China
Zhi Jia: CISRI & NIMTE Joint Innovation Center for Rare Earth Permanent Magnets, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; University of Chinese Academy of Sciences, Beijing 100049, China
Guangfei Ding: CISRI & NIMTE Joint Innovation Center for Rare Earth Permanent Magnets, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; University of Chinese Academy of Sciences, Beijing 100049, China
Shuai Cao: CISRI & NIMTE Joint Innovation Center for Rare Earth Permanent Magnets, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; Corresponding authors at: University of Chinese Academy of Sciences, Beijing 100049, China (R. Chen).
Xintong Yang: CISRI & NIMTE Joint Innovation Center for Rare Earth Permanent Magnets, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Yuhao Li: CISRI & NIMTE Joint Innovation Center for Rare Earth Permanent Magnets, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Xiaodong Fan: CISRI & NIMTE Joint Innovation Center for Rare Earth Permanent Magnets, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Bo Zheng: CISRI & NIMTE Joint Innovation Center for Rare Earth Permanent Magnets, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; Corresponding authors at: University of Chinese Academy of Sciences, Beijing 100049, China (R. Chen).
Renjie Chen: CISRI & NIMTE Joint Innovation Center for Rare Earth Permanent Magnets, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; University of Chinese Academy of Sciences, Beijing 100049, China; Corresponding authors at: University of Chinese Academy of Sciences, Beijing 100049, China (R. Chen).
Shuai Guo: CISRI & NIMTE Joint Innovation Center for Rare Earth Permanent Magnets, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; University of Chinese Academy of Sciences, Beijing 100049, China
Aru Yan: CISRI & NIMTE Joint Innovation Center for Rare Earth Permanent Magnets, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; University of Chinese Academy of Sciences, Beijing 100049, China

Journal volume & issue: Vol. 48
p. 106417

Abstract

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The magnetically hardened shells constructed by the spontaneous core–shell structure due to the enrichment of Y in the core region of (Y/RE)-Fe-B facilitate the enhancement of coercivity. In this work, we systematically compared the metallurgical behaviors of Y in R2Fe14B (RE = Nd, Tb) to investigate the modulation effect of Y on the distribution of REs in the matrix phase. During the strip casting, Y was depleted in the RE-rich phase in Y1/3Nd2/3-Fe-B while enriched in Y1/3Tb2/3-Fe-B. Under the sintering and annealing, Y was simultaneously enriched in the core of matrix phase grain, resulting in the spontaneously formation of Y-rich core and Nd-rich shell structure as well as the Y-rich core and Tb-rich shell structure. Further statistics on the concentration distribution of Y in the matrix phase indicated that the degree of aggregation for Y in Y1/3Nd2/3-Fe-B is higher than that of Y1/3Tb2/3-Fe-B, due to the different formation energy of Re2Fe14B phases. Notably, the spontaneous Y-rich core and Tb-rich shell structure demonstrates the modulation effect of Y on the distribution of Tb, inspiring an innovative scheme for construction of magnetically hardened shells.

Published in Results in Physics

ISSN: 2211-3797 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics
Website: http://www.journals.elsevier.com/results-in-physics/

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