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.
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This work has been supported by the ‘Solid State Physics’ C.N.R. project and by the ‘Ministry of University and Scientific and Technological Research’.
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Malizia, F., Ronconi, F. Dsc and Mössbauer Studies of Fe80B20 Crystallization. MRS Online Proceedings Library 321, 355–360 (1993). https://doi.org/10.1557/PROC-321-355