Effect of coarse grains on magnetic properties of Nd-Fe-Co-B-Ga die-upset magnets

Journal Article · Sat Sep 01 00:00:00 EDT 1990 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (USA)

DOI:https://doi.org/10.1109/20.104505· OSTI ID:5691939

Nozawa, Y; Tanigawa, S; Tokunaga, M ^[1]

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1. Magnetic and Electronic Materials Research Lab., Hitachi Metals, Ltd., 5200 Mikajiri, Kumagaya, Saitama 360 (JP)

Coarse grains contained in Nd-Fe-Co-Ga-Bhot-pressed and die-upset magnets are reviewed. Coarse grains contained in hot-pressed magnets maintain their shapes during die-upsetting and increase deformation resistance. Br, Hk and (BH){sub max} of die-upset magnets decrease with increase in the volume fraction of coarse grains. Equiaxed coarse grains nucleate and grow during melt-spinning. Columnar coarse grains grow during hot-pressing. Volume fraction of coarse grains before die-upsetting should be minimized to increase (BH){sub max}.

• OSTI ID: 5691939
• Journal Information: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (USA), Vol. 26:5; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COBALT BORIDES
MAGNETIC PROPERTIES
IRON BORIDES
MAGNETS
GRAIN SIZE
NEODYMIUM BORIDES
DEFORMATION
HOT PRESSING
BORIDES
BORON COMPOUNDS
COBALT COMPOUNDS
CRYSTAL STRUCTURE
FABRICATION
IRON COMPOUNDS
MATERIALS WORKING
MICROSTRUCTURE
NEODYMIUM COMPOUNDS
PHYSICAL PROPERTIES
PRESSING
RARE EARTH COMPOUNDS
SIZE
TRANSITION ELEMENT COMPOUNDS
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