Journal of Materials Science

, Volume 43, Issue 11, pp 3837–3847 | Cite as

Nanocrystallization of Fe73.5Si13.5B9Nb3Cu1 soft-magnetic alloy from amorphous precursor in a magnetic field

  • Hiromichi Fujii
  • Victoria A. Yardley
  • Takashi Matsuzaki
  • Sadahiro Tsurekawa
Intergranular and Interphase Boundaries in Materials

Abstract

The effect of a magnetic field on the nature of nanocrystallization from a melt-spun Fe73.5Si13.5B9Nb3Cu1 amorphous precursor has been studied with the aim of controlling microstructures and magnetic properties. Annealing for magnetic crystallization was carried out at temperatures between the Curie temperature of the amorphous phase (586 K) and that of the crystalline phase (920 K). It was found that the {110} texture component in crystallized α-Fe(Si) phase increased in importance with increasing magnetic-field strength. An X-ray diffraction analysis based on the Shultz method revealed that the magnetic field caused preferential formation of {110}-oriented nuclei. In addition, the applied field enhanced crystallization kinetics, particularly the nucleation rate. No significant difference in grain growth behavior was observed as a result of applying a magnetic field. We therefore conclude that the development of the {110} texture by magnetic crystallization is predominantly attributable to preferential nucleation, rather than preferential growth, of {110}-oriented nuclei. The saturation magnetization of nanocrystallized specimens, evaluated using a vibrating sample magnetometer (VSM), was increased by the application of a magnetic field up to 4T during nanocrystallization.

Keywords

Magnetic Field Amorphous Phase Saturation Magnetization Amorphous Alloy Nucleation Rate 

Notes

Acknowledgement

The authors would like to express their hearty thanks to Profs. T. Watanabe (Tohoku University) and T. Yokobori, Jr. (Tohoku University) for their useful discussions, Dr. Iguchi (Tohoku University) for his help for X-ray measurements based on Schultz method, and to Hitachi Metals Ltd., for supplying the amorphous alloy used in this study. This work was supported by a Grant-in-Aid for Basic Research (S) (19106013) and a Grant-in-Aid for JSPS Fellows (19·3284) from the Japan Society for the Promotion of Science (JSPS). These supports are greatly appreciated.

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Hiromichi Fujii
    • 1
  • Victoria A. Yardley
    • 1
  • Takashi Matsuzaki
    • 1
  • Sadahiro Tsurekawa
    • 2
  1. 1.Department of Nanomechanics, Graduate School of EngineeringTohoku UniversitySendaiJapan
  2. 2.Faculty of EngineeringKumamoto UniversityKumamotoJapan

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