Grain-Boundary Structures and Evolution in an Nd-Fe-B Sintered Magnet

IF 2.1 3区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Magnetics Pub Date : 2025-02-19 DOI:10.1109/TMAG.2025.3543812

Anhua Li;Yanru Li;Haibo Feng;Wei Li

{"title":"Grain-Boundary Structures and Evolution in an Nd-Fe-B Sintered Magnet","authors":"Anhua Li;Yanru Li;Haibo Feng;Wei Li","doi":"10.1109/TMAG.2025.3543812","DOIUrl":null,"url":null,"abstract":"In the article, the grain-boundary (GB) phase structures of Nd-Fe-B sintered samples with different heat treatments but identical composition were characterized under multiple scales, and the evolution of the GB phase structures was discussed. The optimal <inline-formula> <tex-math>$H_{\\mathrm {cj}}$ </tex-math></inline-formula> has been obtained in the sample adopted nitrogen fast cooling after annealing at 650 °C, and the sample had the optimal GB distribution, with clear and coherent thin-layer GB phases existing between the grains. Transmission electron microscopy (TEM) investigation revealed that the phase-separation phenomena occurred, and the typical band-like structure of altering high Fe phase [amorphous (AM)] and high Nd phase (eutectics) formed in the GB region of the optimal sample. The appearance of the nonferromagnetic high-Nd GB phases is helpful to achieve the high coercivity. The eutectic “Nd2Fe14B+Nd” was observed in the GB region of experimental Nd-Fe-B strip-casting (SC) flakes. The complexity and its cause of grain-boundary phase structures were clarified. Recognizing that Nd-Fe-B alloy belongs to a deep eutectic system is crucial for a systematic and integrate understanding of GB phase structures.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 4","pages":"1-10"},"PeriodicalIF":2.1000,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Transactions on Magnetics","FirstCategoryId":"5","ListUrlMain":"https://ieeexplore.ieee.org/document/10892252/","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}

引用次数: 0

Abstract

In the article, the grain-boundary (GB) phase structures of Nd-Fe-B sintered samples with different heat treatments but identical composition were characterized under multiple scales, and the evolution of the GB phase structures was discussed. The optimal

$H_{\mathrm {cj}}$

has been obtained in the sample adopted nitrogen fast cooling after annealing at 650 °C, and the sample had the optimal GB distribution, with clear and coherent thin-layer GB phases existing between the grains. Transmission electron microscopy (TEM) investigation revealed that the phase-separation phenomena occurred, and the typical band-like structure of altering high Fe phase [amorphous (AM)] and high Nd phase (eutectics) formed in the GB region of the optimal sample. The appearance of the nonferromagnetic high-Nd GB phases is helpful to achieve the high coercivity. The eutectic “Nd2Fe14B+Nd” was observed in the GB region of experimental Nd-Fe-B strip-casting (SC) flakes. The complexity and its cause of grain-boundary phase structures were clarified. Recognizing that Nd-Fe-B alloy belongs to a deep eutectic system is crucial for a systematic and integrate understanding of GB phase structures.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

IEEE Transactions on Magnetics 工程技术-工程：电子与电气

CiteScore

4.00

自引率

14.30%

发文量

565

审稿时长

4.1 months

期刊介绍： Science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage. The IEEE Transactions on Magnetics publishes scholarly articles of archival value as well as tutorial expositions and critical reviews of classical subjects and topics of current interest.