The effects of boron content on the microstructure and exchange coupling effect of Nd{sub 9.5}Fe{sub 85.5{minus}x}B{sub 5+x} melt spun ribbons

Journal Article · Sun Sep 01 00:00:00 EDT 1996 · IEEE Transactions on Magnetics

DOI:https://doi.org/10.1109/20.538889· OSTI ID:400779

Chang, W C; Hsing, D M ^[1]; Ma, B M; Bounds, C O ^[2]

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1. National Chung Cheng Univ., Chia-Yi (Taiwan, Province of China)
2. Rhone-Poulenc Rare Earths and Gallium, Cranbury, NJ (United States)

The magnetic properties, phases transformations and microstructural evolution of Nd{sub 9.5}Fe{sub 85.5{minus}x}B{sub 5+x} (x = 0, 1, 3 and 4) alloy ribbons have been investigated. Excellent magnetic properties with a Br = 11.7 kG, iHc = 6.6 kOe, (BH)max = 18.7 MGOe and Br = 11.4 kG, iHc = 6.3 kOe, (BH)max = 19 MGOe, can be achieved in the alloys with x = 0 and 1, respectively, simply from direct quenching. For alloy ribbons with higher boron content (x = 3 and 4), the magnetic properties degrade and are lower than that of the former even after subsequent annealing. From x-ray diffraction, TEM and magnetic analysis, the degradation of magnetic properties was found to result from the formation of Fe{sub 3}B phase inside Nd{sub 2}Fe{sub 14}B and {alpha}-Fe phases and to grain coarsening leading to the reduction of the exchange coupling effect between Nd{sub 2}Fe{sub 14}B and {alpha}-Fe or Fe{sub 3}B phases.

• OSTI ID: 400779
• Report Number(s): CONF-960425--
• Journal Information: IEEE Transactions on Magnetics, Journal Name: IEEE Transactions on Magnetics Journal Issue: 5Pt2 Vol. 32; ISSN IEMGAQ; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORON
BORON ALLOYS
CRYSTAL-PHASE TRANSFORMATIONS
EXPERIMENTAL DATA
IRON BASE ALLOYS
MAGNETIC PROPERTIES
METALLURGICAL EFFECTS
MICROSTRUCTURE
NEODYMIUM ALLOYS