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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 mechanism of the isothermal crystallization kinetics in Fe80B20 Metallic glass. It is shown that the whole crystallization analysis must include, not only a crystal nucleation-and-growth process, but also a grain-growth process and that these two processes are separated in time during isothermal annealing. These processes have been studied directly finding the parameters which characterize their Mechanism. From the theoretical Johnson-Mehl-Avrami equation describing the nucleation-and-growth process, it was possible to calculate the evolution of the transformed fraction of the material as a function of the annealing time. To infer the meaning of the transformed fraction, samples subjected to different thermal treatments have been studied by Mössbauer Spectroscopy. Our results reveal that the transformed fraction is the sum of the crystalline component formed by all atoms located in the lattice of the grains and the interfacial component composed of atoms in the interfacial regions 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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