Unveiling the homogenization microstructure evolution and its effect on cellular structure for Fe-rich Sm-Co-Fe-Cu-Zr magnets  

作　　者：Qiangfeng Li Chao Wang Lei Wang Yifei Bi Yikun Fang Yue Zhang Minggang Zhu Wei Li 

机构地区：[1]Division of Functional Materials,Central Iron and Steel Research Institute,Beijing 100081,China [2]Academy for Advanced Interdisciplinary Science and Technology,Beijing Advanced Innovation Center for Materials Genome Engineering and Beijing Key Laboratory for Advanced Energy Materials and Technologies,School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Journal of Materials Science & Technology》2024年第27期142-150,共9页材料科学技术(英文版)

基　　金：supported in part by the National Key Research and Development Program of China(Nos.2021YFB3503100,2022YFB3505303,and 2021YFB3501500);the Key Technology Research and Development Program of Shandong(No.2019JZZY020210);the Major Projects in Inner Mongolia Autonomous Region of China.

摘　　要：The solution-treated Fe-rich 2:17-type Sm-Co-based magnets generally contain an inhomogeneous mi-crostructure,which hinders the development of the complete cellular structure required for high-performance magnets.Here,the microstructure evolution of Sm(Cobal Fe_(0.31)Cu_(0.07)Zr_(0.025))_(7.7)magnet during the solution treatment is systematically investigated.Unlike the normal Fe-medium magnets,it was in-terestingly found that the initial-stage solution-treated Sm(Cobal Fe_(0.31)Cu_(0.07)Zr_(0.025))_(7.7)magnet possesses a profuse lamellar-type microstructure.Within the lamellar-type microstructure,there are three microre-gions exhibiting an obvious difference in composition and 2:17R ordering degree.Further,various 1:3R phases precipitated within the lamellar-type microstructure.With the disappearance of lamellar-type mi-crostructure,the 1:7H phase increased substantially,and the distribution of defect-aggregated cell bound-aries became uniform,promoting the homogeneous precipitation of 1:5H cell boundary phases during aging.The current study reveals a typical microstructural evolution in Fe-rich 2:17-type Sm-Co-based magnets during solution treatment.

关 键 词：Sm_(2)Co_(17)magnet Supersaturated solid solution Phase transformation TEM 

分 类 号：TM2[一般工业技术—材料科学与工程]