首页|Significant effect of ordered micro-domain on cell boundary phase distribution and demagnetization curve squareness of Sm2Co17-type magnet

Significant effect of ordered micro-domain on cell boundary phase distribution and demagnetization curve squareness of Sm2Co17-type magnet

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Cu-rich cell boundary phase is difficult to pre-cipitate evenly,resulting in a generally poor demagneti-zation curve squareness for Fe-rich Sm2Co17-type magnet,which is a key factor limiting the further improvement of magnetic energy product.In this study,we report that nanoscale strip-like ordered micro-domains distributed in 1∶7H disordered matrix phase of the solid solution pre-cursor is a new factor significantly affecting the precipi-tation and distribution of the cell boundary phase.Long strip-like and continuous micro-twin structure with twin boundaries neatly perpendicular to the C-axis is observed after sintering treatment.After solution treatment,sequential and long strip-like micro-twins gradually trans-form into disordered state along the basal plane,forming narrow disordered 1∶7H(TbCu7-type structure)phase between the separated strip-like ordered micro-domains.This disordering transformation takes place via broken down of the long strip-like ordered micro-domains,which is accomplished by narrowing along the width direction followed by reduction of the length.Furthermore,a new model revealing the effect of the ordered micro-domains on the formation of the cell boundary phase is proposed.Antiphase boundaries enriched in Cu have already existed in the precursor with long strip-like ordered micro-do-mains.Therefore,the Cu-rich cell boundary phase acting as strong pinning centers cannot be precipitated homoge-neously and distributed continuously after aging,resulting in a poor demagnetization curve squareness of Sm2Co17-type magnet.Our results indicate that significant broken down of the nanoscale ordered micro-domains in solution precursor is the key factor improving the distribution of cell boundary phase in Sm2Co17-type magnets.

Sm2Co17 magnetsSolution precursorOrdered micro-domainsDisordering transformationCellular structure

Zhuang Liu、Hai-Chen Wu、Chao-Yue Zhang、Chao-Qun Zhu、Guo-Xin Chen、Huan-Ming Lu、Ren-Jie Chen、Aru Yan

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CISRI & NIMTE Joint Innovation Center for Rare Earth Permanent Magnets,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China

University of Chinese Academy of Sciences,Beijing 100049,China

Analytical Center,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China

National Key R&D Program of ChinaZhejiang Provincial Key R&D ProgramScience and Technology Innovation 2025 Major Project of NingboNingbo Key R&D ProgramNingbo Natural Science Foundation

2021YFB35031022021C011912020Z03720222ZDYF0200272021J216

2024

10.1007/s12598-023-02502-x

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(4)
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