Nanocrystallization process in Finemet-type alloys followed by in situ 57Fe Mössbauer spectroscopy

V. A.Peña Rodríguez, J. Flores Regalado, E. Baggio-Saitovitch, E. C. Passamani

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High-temperature in situ 57Fe Mössbauer spectroscopy was used to investigate the nanocrystallization process in Fe73.5Si 13.5B9Cu1Nb1X2 (X=Zr, Nb, Mo and V) amorphous alloys. The Mössbauer spectra were taken at temperatures where only the amorphous phase is found in a paramagnetic state, allowing an accurate resolution between the amorphous and crystalline phases presented in the annealed ribbons. The Johnson-Mehl-Avrami theory was used to describe the increase of the crystalline fraction (in vol.%) as a function of the annealing time. The volume fraction of the iron-silicate nanocrystalline phase, found in each of the alloys annealed under similar conditions, increases in the sequence Zr<Nb<Mo<V. The value of the Avrami exponent, determined for each alloy, is near 1, indicating a controlled diffusion process with a nucleation rate close to zero. An activation energy of 3eV was found for the studied alloys. © 2004 Elsevier B.V. All rights reserved.
Original languageAmerican English
Pages (from-to)23-27
Number of pages5
JournalJournal of Alloys and Compounds
StatePublished - 6 Oct 2004


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