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Metastable Sigma-phase Formation by Crystallization of Amorphous Fe-Si-B and Fe-Cr-V-B Alloys

Metastable Sigma-phase Formation by Crystallization of Amorphous Fe-Si-B and Fe-Cr-V-B Alloys Initial stages of crystallization of amorphous iron base alloys were investigated by means of transmission electrone microscopy, X-ray diffraction, differential thermal analysis. Metastable phase with structure type of sigma phase (e.g., in Fe-Cr alloys) was observed in melt spun ribbons by rapid heating or annealing at temperatures below the first exothermic peak of DTA curve. The composition of 6-phase is close to that of amorphous matrix—it contains a considerable amount of metalloid atoms. Sigma-phase is formed in Fe-Si-B alloys which do not contain metal atoms other than Fe. Sigma phase appears also as an intermediate stage before formation of nanocrystalline “finemet”-type structure on the base of α-Fe in Fe-V-B alloy. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Performance Materials Springer Journals

Metastable Sigma-phase Formation by Crystallization of Amorphous Fe-Si-B and Fe-Cr-V-B Alloys

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Publisher
Springer Journals
Copyright
Copyright © 1997 by Kluwer Academic Publishers
Subject
Engineering; Automotive Engineering; Characterization and Evaluation of Materials; Classical Mechanics; Metallic Materials
ISSN
0929-1881
eISSN
1572-8765
DOI
10.1023/A:1008647630546
Publisher site
See Article on Publisher Site

Abstract

Initial stages of crystallization of amorphous iron base alloys were investigated by means of transmission electrone microscopy, X-ray diffraction, differential thermal analysis. Metastable phase with structure type of sigma phase (e.g., in Fe-Cr alloys) was observed in melt spun ribbons by rapid heating or annealing at temperatures below the first exothermic peak of DTA curve. The composition of 6-phase is close to that of amorphous matrix—it contains a considerable amount of metalloid atoms. Sigma-phase is formed in Fe-Si-B alloys which do not contain metal atoms other than Fe. Sigma phase appears also as an intermediate stage before formation of nanocrystalline “finemet”-type structure on the base of α-Fe in Fe-V-B alloy.

Journal

Advanced Performance Materials – Springer Journals

Published: Sep 28, 2004

References

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    Inoue, A.; Iwadachi, T.; Minemura, T.; Masumoto, T.
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    Chen, V.C.; Chen, C.M.; Su, K.
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    Lyasotskii, I.V.; Dyakonov, D.L.; Dyakonova, N.B.
  • Physics of ferromagnetic amorphous alloys
    O'Handley, R.C.
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    Bergman, G.; Shoemaker, D.
  • The structure of the 6 phase in vanadium-nickel alloys
    Pearson, W.B.; Christian, J.W.
  • Thermodynamic analysis of crystallization of amorphous Fe-M-B alloys
    Tomilin, I.A.; Kaloshkin, S.D.