Impact of Nd–Cu diffusion on microstructure and coercivity in hot-pressed and die-upset nanocomposite magnets

The microstructure evolution in hot-pressed and die-upset magnets was studied to clarify the impact of Nd–Cu diffusion on microstructure and coercivity. It was found that Nd–Cu diffusion mainly occurs at the interface of the raw powders during the hot-pressing process. In the die-upsetting process,...

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Published inScripta materialia Vol. 88; pp. 49 - 52
Main Authors Tang, Xin, Chen, Renjie, Yin, Wenzong, Wang, Jinzhi, Tang, Xu, Lee, Don, Yan, Aru
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.10.2014
Subjects
Coercive force
Coercivity
COMPOSITES
Die upsetting
DIES
DIFFUSION
Grain boundary diffusion
Hot pressing
IMPACT PROPERTIES
MAGNETS
Microstructure
MICROSTRUCTURES
Nd2Fe14B/α-Fe nanocomposite magnet
Neodymium
PHASES
Hot pressing
Die upsetting
Grain boundary diffusion
Coercivity
Nd2Fe14B/α-Fe nanocomposite magnet
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Summary:The microstructure evolution in hot-pressed and die-upset magnets was studied to clarify the impact of Nd–Cu diffusion on microstructure and coercivity. It was found that Nd–Cu diffusion mainly occurs at the interface of the raw powders during the hot-pressing process. In the die-upsetting process, grain boundary diffusion is main reason for the homogeneous distribution of Nd–Cu. Moreover, Nd–Cu grain boundary diffusion decoupling the hard phases, grain morphology and the presence of Nd2O3 contribute to the higher coercivity in die-upset magnets with low height reduction.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2014.05.014