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
- National Chung Cheng Univ., Chia-Yi (Taiwan, Province of China)
- 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-; ISSN 0018-9464; TRN: IM9650%%185
- Journal Information:
- IEEE Transactions on Magnetics, Vol. 32, Issue 5Pt2; Conference: 1996 IEEE international magnetics conference, Seattle, WA (United States), 9-12 Apr 1996; Other Information: PBD: Sep 1996
- Country of Publication:
- United States
- Language:
- English
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