Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/8506
Title: Magnetization versus heat treatment in rapidly solidified NdFeB alloys
Author: Clavaguera-Mora, M. T.
Baró, M. D.
Suriñach, Santiago (Suriñach Cornet)
Diego, J. A.
Clavaguera, N. (Clavaguera Plaja)
Keywords: Ferromagnetisme
Aliatges
Substàncies amorfes
Microscòpia electrònica d'escombratge
Anàlisi tèrmica
Ferromagnetism
Alloys
Amorphous substances
Scanning electron microscopy
Thermal analysis
Issue Date: 1990
Publisher: IEEE
Abstract: NdFeB melt-spun amorphous or partially amorphous alloys of four compositions were prepared. Their crystallization kinetics induced by thermal treatment was studied by differential scanning calorimetry and scanning and transmission electron microscopy. Scanning electron microscopy demonstrated that heterogeneous nucleation occurs preferentially at the ribbon surface which was in contact with the wheel. The explicit form of the kinetic equation that best describes the first stage of crystallization under high undercooling conditions was obtained for each alloy. From the crystallization results, the lower part of the experimental time-temperature-transformation curves was deduced for each alloy and extrapolated up to the high-temperature limit of their validity. Microstructural observations showed a typical size of the microcrystals obtained by heat treatment of ~100 nm. From the magnetic properties measured with a vibrating sample magnetometer, the same magnetic behavior of partially crystallized alloys is observed regardless of the temperature of annealing provided the same crystallization fraction, x, is achieved, at least for small values of x (typically ~10%).
Note: Reproducció del document publicat a http://dx.doi.org/10.1109/20.104815
It is part of: IEEE Transactions on Magnetics, 1990, vol. 26, núm. 5, p. 2613-2615.
URI: http://hdl.handle.net/2445/8506
ISSN: 0018-9464
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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