Magnetic properties and microstructures of Nd-Dy-Fe-Co-B-Ga hot-deformed magnets

Die-upset, fully-dense nanocrystalline magnets were prepared from Nd-Dy-Fe-Co-B, Pr-Dy-Fe-Co-B, and Nd-Dy-Fe-Co-B-Ga alloys. The substitution of Nd with Pr was observed to dramatically increase the H/sub ci/ of a hot deformed magnet, while a Ga addition significantly increased the B/sub r/ and H/sub...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2004-07, Vol.40 (4), p.2892-2894
Main Authors: McGuiness, P.J., Drazic, G., Kobe, S., Brown, D.N., Ma, B.M.
Format: Article
Language:English
Subjects:
Atomic measurements
Coercive force
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic materials
Magnetic properties
Magnetic properties and materials
Magnetism
Magnets
Microstructure
Neodymium
Physics
Powders
Transmission electron microscopy
Workability
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Summary:Die-upset, fully-dense nanocrystalline magnets were prepared from Nd-Dy-Fe-Co-B, Pr-Dy-Fe-Co-B, and Nd-Dy-Fe-Co-B-Ga alloys. The substitution of Nd with Pr was observed to dramatically increase the H/sub ci/ of a hot deformed magnet, while a Ga addition significantly increased the B/sub r/ and H/sub ci/ of an equivalent magnet. High-resolution transmission electron microscope (HRTEM) techniques have identified a discreet Ga-rich grain-boundary phase, which is associated with grain-boundary smoothing and enhanced hot workability, and hence improved magnetic performance.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2004.832281