Grain boundary diffusion behaviors in hot-deformed Nd^sub 2^Fe^sub 14^B magnets by PrNd-Cu low eutectic alloys

High coercivity of hot-deformed Nd2Fe14B magnets was obtained by grain boundary diffusion. Comparable squareness and similar magnetic properties for samples diffusing from side and pole surfaces show little discrepancies if quantities of the infiltrated PrNd-Cu low eutectic alloys is enough to obtai...

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Bibliographic Details
Published inJournal of magnetism and magnetic materials Vol. 445; p. 66
Main Authors Tang, Xu, Chen, Renjie, Li, Ming, Jin, Chaoxiang, Yin, Wenzong, Lee, Don, Yan, Aru
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier BV 01.01.2018
Subjects
Alloys
Coercivity
Copper base alloys
Deformation mechanisms
Diffusion
Eutectic alloys
Grain boundaries
Grain boundary diffusion
Magnetic properties
Magnetism
Magnets
Neodymium
Phases
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Summary:High coercivity of hot-deformed Nd2Fe14B magnets was obtained by grain boundary diffusion. Comparable squareness and similar magnetic properties for samples diffusing from side and pole surfaces show little discrepancies if quantities of the infiltrated PrNd-Cu low eutectic alloys is enough to obtain sufficient diffusion. However, the microstructures and higher characteristic peak ratios show preferable orientation of grains near surfaces of the sample diffused from side surfaces than that from pole surfaces. Amorphous Nd-rich phases and crystal Fe-rich phases were both observed in the diffused magnets. The enhancement of coercivity is considered to be resulted from grain boundary optimization and magnetic isolation which is caused by the thickened nonmagnetic intergranular phases.
ISSN:0304-8853
1873-4766