Hostname: page-component-848d4c4894-ndmmz Total loading time: 0 Render date: 2024-04-30T17:09:56.892Z Has data issue: false hasContentIssue false
  • English
  • Français

Quantitative Crystallization and Nano-Grain Size Distribution Studies of a Fecunbsib Nanocrystalline Alloy

Published online by Cambridge University Press:  21 February 2011

M.S. Leu  and
T.S. Chin
M.S. Leu
Affiliation:
Department of Materials Sci. & Eng., Tsing Hua University, 300, Taiwan, ROC
T.S. Chin
Affiliation:
Materials Research Lab., Industrial Tech. Research Institute, 310, Taiwan, ROC
Get access

Abstract

Superior soft magnetic properties of nanocrystalline two-phase FeCuNbSiB alloy can only be attainable from a suitably nano-crystallized structure in the amorphous matrix. In this study a thermal-cycling-annealing process was adopted to anneal the amorphous specimens. The crystallization fraction of Fe73.5Cu1Nb3Si13 5B9 ribbons after different annealing was quantitatively measured by a DTA method through the integrated crystallization enthalpy from annealed samples versus that of as-cast amorphous specimen. The crystallization fraction was estimated to be 70 % as the specimen was annealed for 550°C×7.63 ks, the optimal annealing condition. Using this method, the crystallization quantity of the crystallized FeCuNbSiB amorphous alloy was accurately estimated and controlled during nano-crystallization processes.

Abstact:

The nanostructure of the annealed flake were investigated by high resolution TEM. The population of grain size is dominant in the range of 3-9 and 3-11 nm, corresponding to isothermal annealing at 520 and 550 °C, respectively, for 910 s. The average grain size associated with the above two annealing conditions is estimated to be 7 and 8.5 nm, respectively. The portion of nanocrystals with grain size smaller than 10 nm is about 80 % for the annealing at 520°C×910 s and 72 % for the annealing at 550°C×910 s, respectively. However, there is only one α-Fe(Si) phase evidenced in the TEM diffraction patterns.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 577: Symposium H – Advanced Hard and Soft Magnetic Materials , 1999 , 557
Copyright
Copyright © Materials Research Society 1999

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Yoshizawa, Y., Oguma, S., and Yamauchi, K., J. Appl. Phys., 64, 6044 (1988).Google Scholar
2. Yoshizawa, Y. and Yamauchi, K., Mat. Res. Soc. Symp. Proc., 183 (1991).Google Scholar
3. Herzer, G., Mater. Sci. Eng. A133, 1 (1991).Google Scholar
4. Herzer, G., IEEE Trans. Magn., vol. 25, 3327 (1989).Google Scholar
5. Leu, M.S. and Chin, T. S., J. Appl. Phys. 81, 1 (1997).Google Scholar
6. Leu, M.S., Chin, T. S., Tung, I-C. and Lee, C. M., Jpn. J. Appl. Phys. 38, 4083 (1999).Google Scholar
7. Müller, Manfred, Mattern, N., and IIIgen, L., Z. Metallkde, 82, 895 (1991).Google Scholar
8. Kulik, Tadeusz, Mater. Sci. Eng., A159, 95 (1992).Google Scholar
9. Hono, K., Hiraga, K., Wang, Q., Inoue, A. and Sakurai, T., Acta Metall. Mater., 40, 2137 (1992).Google Scholar