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

• Published in: IEEE transactions on magnetics Vol. 40; no. 4; pp. 2892 - 2894
• Main Authors: McGuiness, P.J., Drazic, G., Kobe, S., Brown, D.N., Ma, B.M.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01-07-2004; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• 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; rare earth permanent magnets; grain boundaries; Die upset; Magnetic materials; gallium; praseodymium; high-resolution transmission electron microscope (HRTEM)
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2004.832281

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.