Controlled solidification and magnetic properties of Pr-Fe-B-Cu and Nd-Fe-B alloys

Journal Article · Fri Nov 15 04:00:00 EST 1991 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.350060· OSTI ID:5126582

Faria, R N; Abell, J S; Harris, I R ^[1]

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1. Department of Metallurgy and Materials, University of Birmingham, Edgbaston, B15 2TT (United Kingdom)

The as-cast microstructure of the alloys Pr{sub 20.5}Fe{sub 73.8}B{sub 3.7}Cu{sub 2} and Nd{sub 16}Fe{sub 76}B{sub 8} have been modified using a vertical floating-zone (VFZ) technique. By annealing the as-cast alloys and VFZ material at 1000 {degree}C, the magnetic properties increased substantially for Pr-Fe-B-Cu alloy. VFZ growth rates up to 38 cm/h have not been sufficient to reproduce the as-cast ingot microstructure of the Pr-Fe-B-Cu alloy. Cast magnets prepared in a very small chill mold showed the best magnetic properties, with a (BH){sub max}=98 kJ/m{sup 3}. Sintered magnets prepared using the hydrogen decrepitation process from the large grained Nd-Fe-B zoned alloys exhibit inferior squareness factors to those prepared from the as-cast ingot.

• OSTI ID: 5126582
• Journal Information: Journal of Applied Physics; (United States), Journal Name: Journal of Applied Physics; (United States) Vol. 70:10; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
ALLOYS
BORON ALLOYS
COPPER ALLOYS
CRYSTAL STRUCTURE
IRON ALLOYS
IRON BASE ALLOYS
MAGNETIC PROPERTIES
MAGNETS
MATERIALS
MICROSTRUCTURE
NEODYMIUM ALLOYS
PERMANENT MAGNETS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PRASEODYMIUM ALLOYS
RARE EARTH ALLOYS
SINTERED MATERIALS
SOLIDIFICATION