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Stability of (Fe-Tm-B) amorphous alloys: relaxation and crystallization phenomena

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Abstract

Fe-Tm-B base (TM=transition metal) amorphous alloys (metallic glasses) are thermodynamically metastable. This limits their use as otherwise favourable materials, e.g. magnetically soft, corrosion resistant and mechanically firm. By analogy of the mechanical strain-stress dependence, at a certain degree of thermal activation the amorphous structure reaches its limiting state where it changes its character and physical properties. Relaxation and early crystallization processes in amorphous alloys, starting already around 100°C, are reviewed involving subsequently stress relief, free volume shrinking, topological and chemical ordering, pre-crystallization phenomena up to partial (primary) crystallization. Two diametrically different examples are demonstrated from among the soft magnetic materials: relaxation and early crystallization processes in the Fe-Co-B metallic glasses and controlled crystallization of amorphous ribbons yielding rather modern nanocrystalline “Finemet” alloys where late relaxation and pre-crystallization phenomena overlap when forming extremely dispersive and fine-grained nanocrystals-in-amorphous-sauce structure. Mössbauer spectroscopy seems to be unique for magnetic and phase analysis of such complicated systems.

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Authors and Affiliations

  1. Institute of Physical Metallurgy, Academy of Sciences of the Czech Republic, Žižkova 22, 61662, Brno, Czech Republic

    T. Zemčík

  2. Joint Mössbauer Laboratory, Faculty of Mathematics and Physics, Charles University, V Holesovickách 2, 180 00, Prague, Czech Republic

    T. Zemčík

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Zemčík, T. Stability of (Fe-Tm-B) amorphous alloys: relaxation and crystallization phenomena. Hyperfine Interact 83, 131–145 (1994). https://doi.org/10.1007/BF02074265

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