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DSC and Mössbauer Studies of Fe80B20 Crystallization

Published online by Cambridge University Press:  15 February 2011

Federica Malizia  and
Franco Ronconi
Federica Malizia
Affiliation:
University of Ferrara, Department of Physics, Via Paradiso 12, 1–44100 Ferrara, Italy Unità Consorzio Interuniversitario Nazionale Fisica della materia and Gruppo Nazionale Struttura della Materia (C.N.R.)
Franco Ronconi
Affiliation:
University of Ferrara, Department of Physics, Via Paradiso 12, 1–44100 Ferrara, Italy Unità Consorzio Interuniversitario Nazionale Fisica della materia and Gruppo Nazionale Struttura della Materia (C.N.R.)
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Abstract

Differential Scanning Calorimetry has been used to investigate the mechanismof the isothermal crystallization kinetics in Fe80B20 Metallic glass. It is shown that the whole crystallizationanalysis must include, not only a crystal nucleation-and-growth process, butalso a grain-growth process and that these two processes are separated intime during isothermal annealing. These processes have been studied directlyfinding the parameters which characterize their Mechanism. From thetheoretical Johnson-Mehl-Avrami equation describing thenucleation-and-growth process, it was possible to calculate the evolution ofthe transformed fraction of the material as a function of the annealingtime. To infer the meaning of the transformed fraction, samples subjected todifferent thermal treatments have been studied by Mössbauer Spectroscopy.Our results reveal that the transformed fraction is the sum of thecrystalline component formed by all atoms located in the lattice of thegrains and the interfacial component composed of atoms in the interfacialregions between grains.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 321: Symposium E – Crystallization and Related Phenomena in Amorphous Materials—Ceramics, Metals, Polymers, and Semiconductors , 1993 , 355
Copyright
Copyright © Materials Research Society 1994

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References

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