Nucleation control for fine nano crystallization of Fe-based amorphous alloy by high-magnetic-field annealing

•The growth curve of the precipitated bcc-Fe is estimated by magnetization.•The magnetic field increases the nucleation rate of ferromagnetic crystal.•The accelerated nucleation originates from the Zeeman energy of the crystal phase.•In-field crystallization can lead the high number density of the c...

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Bibliographic Details
Published in:Journal of alloys and compounds 2015-07, Vol.637, p.213-218
Main Authors: Onodera, Reisho, Kimura, Shojiro, Watanabe, Kazuo, Yokoyama, Yoshihiko, Makino, Akihiro, Koyama, Keiichi
Format: Article
Language:English
Subjects:
Amorphous alloys
Crystallization
Evolution
Gain
High magnetic field
Iron-based amorphous alloy
Magnetic field effect
Magnetic fields
Magnetization
Magnetization measurement
Metallic glasses
Nucleation
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Summary:•The growth curve of the precipitated bcc-Fe is estimated by magnetization.•The magnetic field increases the nucleation rate of ferromagnetic crystal.•The accelerated nucleation originates from the Zeeman energy of the crystal phase.•In-field crystallization can lead the high number density of the crystal grain. The magnetization measurements for an Fe83.3Si4.2B12.5 amorphous alloy were carried out to investigate the magnetic field effect on the crystallization kinetics. From the isochronal measurements, the gain of the Zeeman energy was estimated from the increase of magnetization at the crystallization temperature. By the isothermal measurements, the growth curve of bcc-Fe(Si), which is the primary crystal phase of this material, was obtained. The growth curve at 10T shows more abrupt time evolution, compared with that at 0.5T. However, the growth curves as a function of the scaled time converge to a universal sigmoidal curve, regardless of the applied magnetic field strength. These behaviors indicate that the rate of this crystallization reaction is increased, whereas the crystallization process is not changed by applying the high magnetic field.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2015.02.197