Die-upset Pr-Fe-B-type magnets from melt-spun ribbons

Journal Article · Fri Apr 15 00:00:00 EDT 1994 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.356006· OSTI ID:5053633

Fuerst, C D; Brewer, E G; Mishra, R K ^[1]; Zhu, Y; Welch, D O ^[2]

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1. Physics Department, General Motors NAO Research and Development Center, Warren, Michigan 48090-9055 (United States)
2. Department of Applied Science, Brookhaven National Laboratory, Upton, New York 11973 (United States)

In order to optimize the magnetic properties of die-upset Pr-Fe-B magnets, we have systematically altered alloy compositions, including partial substitution of cobalt and neodymium, and low-level additions of gallium. In general, the remanences of Pr-Fe-B die-upset magnets were lower by [similar to]1 kG, and coercivities were higher by [similar to]4 kOe, than analogous Nd-Fe-B magnets. The microstructure of the Pr-Fe-B die-upset magnets was similar to Nd-Fe-B magnets. Both systems are two phase, consisting of oriented flat platelet-shaped grains of 2-14-1 separated by a rare earth-rich intergranular phase. The intergranular phase is thicker for the Pr-Fe-B magnets, resulting in enhanced magnetic domain wall pinning and increased coercivity. Even higher coercivities were obtained with small amounts of cobalt substitution ([le]5 at. % of the transition metal) and by very low-level additions of gallium ([le]0.5 at. %). The largest remanence ([ital B][sub [ital r]]=13.7 kG) for a Pr-based 75% die-upset magnet was obtained with the alloy (R[sub 13]TM[sub 81]B[sub 6])[sub 0.9975]Ga[sub 0.25], where R=(Pr[sub 0.8]Nd[sub 0.2]) and TM=(Fe[sub 0.95]Co[sub 0.05]).

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5053633
• Journal Information: Journal of Applied Physics; (United States), Vol. 75:8; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
PERMANENT MAGNETS
MAGNETIC PROPERTIES
PRASEODYMIUM BASE ALLOYS
COERCIVE FORCE
BORON ALLOYS
COBALT ADDITIONS
GALLIUM ADDITIONS
IRON ALLOYS
MICROSTRUCTURE
NEODYMIUM ADDITIONS
ALLOYS
COBALT ALLOYS
GALLIUM ALLOYS
MAGNETS
NEODYMIUM ALLOYS
PHYSICAL PROPERTIES
PRASEODYMIUM ALLOYS
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
360104* - Metals & Alloys- Physical Properties