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Electron microscopy study of (Fe-Co)-Nb-Si-B alloys

D. M. KEPAPTSOGLOU1, G. POLYCHRONIADIS2, K. G. EFTHIMIADIS2, P. SVEC3, E. HRISTOFOROU1,*

Affiliation

  1. Laboratory of Physical Metallurgy, National Technical University of Athens, 9 Heroon Polytechniou str., Zografou Campus, Athens, 15780, Greece
  2. Physics Department, Aristotle University of Thessaloniki, GR-54124, Thessaloniki, Greece
  3. Institute of Physics, Slovak Academy of Sciences, Dubravska cesta 9, 845 11 Bratislava, Slovakia

Abstract

Phases produced during crystallization of (Fe1Co4)73Nb7Si5B15 amorphous alloy were studied by means of conventional and in-situ heating transmission electron microscopy. Differences in structure, morphology and grain size distributions are discussed. Apparent discrepancies in crystallization kinetics in thinned - originally amorphous, in-situ annealed samples versus samples a-priori annealed and thinned are shown to originate from sample dimensions and preparation methods. Information thus obtained is used for indication of the importance of surface and bulk effects during phase transformations. Results are correlated with the classical analysis of transformations from amorphous state..

Keywords

Electron microscopy, Nanocrystalline alloys, Crystallization kinetics, Phase transformations.

Submitted at: Sept. 9, 2006
Accepted at: Sept. 13, 2006

Citation

D. M. KEPAPTSOGLOU, G. POLYCHRONIADIS, K. G. EFTHIMIADIS, P. SVEC, E. HRISTOFOROU, Electron microscopy study of (Fe-Co)-Nb-Si-B alloys, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 5, pp. 1775-1779 (2006)