Magnetic properties and microstructure of melt-spun Nd-Fe-Ga-B alloys

Journal Article · Wed Nov 01 04:00:00 EST 1995 · IEEE Transactions on Magnetics

DOI:https://doi.org/10.1109/20.489587· OSTI ID:186925

Panagiotopoulos, I; Murthy, A S; Hadjipanayis, G C ^[1]

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1. Univ. of Delaware, Newark, DE (United States). Dept. of Physics and Astronomy

The magnetic and microstructural properties of melt-spun Nd{sub 18}Fe{sub 76{minus}X}Ga{sub X}B{sub 6} alloys have been studied as a function of Ga content. Coercivities of 17 kOe were obtained in underquenched samples having a large grain size of 500 nm. Samples prepared at wheel speeds of 15--19 m/sec, as well as overquenched (40 m/sec) and subsequently annealed, gave coercivities of around 20 kOe with no significant improvement of H{sub c} upon Ga substitution. In Ga-free samples prepared by annealing highly overquenched ribbons (at 60 m/sec) only moderate coercive fields could be achieved (14 kOe). These samples had grain sizes of 70--100 nm. However Ga substituted samples prepared under the same conditions have a fine grain structure consisting of unequiaxed grains with size around 20 nm and show coercivities up to 23 kOe.

• OSTI ID: 186925
• Report Number(s): CONF-950404--
• Journal Information: IEEE Transactions on Magnetics, Journal Name: IEEE Transactions on Magnetics Journal Issue: 6Pt2 Vol. 31; ISSN IEMGAQ; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORON ALLOYS
COERCIVE FORCE
EXPERIMENTAL DATA
GALLIUM
GALLIUM ALLOYS
GRAIN SIZE
IRON BASE ALLOYS
MAGNETIC PROPERTIES
METALLURGICAL EFFECTS
MICROSTRUCTURE
NEODYMIUM ALLOYS
PERMANENT MAGNETS