Coercivity enhancement of hydrogenation–disproportionation–desorption–recombination processed Nd–Fe–B powders by the diffusion of Nd–Cu eutectic alloys

We report the coercivity enhancement of hydrogenation–disproportionation–desorption–recombination processed Nd–Fe–B nanocrystalline powders from 1321 to 1552 kA m −1 (19.5 kOe) by the grain boundary diffusion of Nd–Cu melts with hyper-eutectic compositions. A distinct Nd-rich grain boundary phase wa...

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Bibliographic Details
Published inScripta materialia Vol. 63; no. 11; pp. 1124 - 1127
Main Authors Sepehri-Amin, H., Ohkubo, T., Nishiuchi, T., Hirosawa, S., Hono, K.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.11.2010
Subjects
BOUNDARIES
COERCIVE FORCE
Coercivity
DIFFUSION
Diffusion process
Ferrous alloys
GRAIN BOUNDARIES
HYDROGEN
HYDROGENATION
IRON ALLOYS (50 TO 99 FE)
MAGNETIC MATERIALS
Nd–Fe–B
Permanent magnet
PHASE TRANSFORMATIONS
SCANNING ELECTRON MICROSCOPY
Nd–Fe–B
Diffusion process
Permanent magnet
Coercivity
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Summary:We report the coercivity enhancement of hydrogenation–disproportionation–desorption–recombination processed Nd–Fe–B nanocrystalline powders from 1321 to 1552 kA m −1 (19.5 kOe) by the grain boundary diffusion of Nd–Cu melts with hyper-eutectic compositions. A distinct Nd-rich grain boundary phase was observed after the diffusion process by scanning electron microscopy and transmission electron microscopy; however, atom probe tomography indicated that the change in composition of the grain boundary phase was not significant. The mechanism of the coercivity enhancement is discussed based on these results.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2010.08.021