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Study on Microstructure and Coercivity of Thermally Processed Nd-Fe-B-type HDDR Material

TitleStudy on Microstructure and Coercivity of Thermally Processed Nd-Fe-B-type HDDR Material
Publication TypeJournal Article
Year of Publication2018
AuthorsKim, KM, Kang, MS, Kwon, HW, Kim, TH, Yang, CW, Lee, JG, Yu, JH
JournalJournal of Magnetics
Volume23
Pagination274-279
Date Published06
Type of ArticleArticle
ISBN Number1226-1750
Accession NumberWOS:000438152000018
Keywordscoercivity, Materials Science, Microstructure, Nd-Fe-B-type HDDR material, physics, sintered magnets
Abstract

Variation of intrinsic coercivity of the HDDR-treated Nd12.5Fe80.8B6.4Ga0.3 alloy after heating in various modes was investigated. Influence of vacuum degree and cooling after heating on the coercivity of the HDDR material was examined. The heat-treated HDDR material had consistently higher coercivity when it was quenched after heating compared to when slow-cooled. Higher coercivity in the quenched material was attributable to the grain boundary with lower Fe content. HDDR-treated material heated in high vacuum showed consistently higher coercivity than the material heated in lower vacuum, and this was attributed to less heavily oxidized surface. Reduced coercivity of the HDDR-treated material heated at moderate temperature was noticeably recovered at higher temperature, and this was attributed to lower Fe content in the grain boundary.

DOI10.4283/jmag.2018.23.2.274
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Short TitleJ. Magn.
Alternate JournalJ. Magn.