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Evolution of structure and microstructure of nanoperm nanocrystalline alloy with temperature

M. MIGLIERINI1,*

Affiliation

  1. Slovak University of Technology, Department of Nuclear Physics and Technology, Ilkovičova 3, 812 19 Bratislava, Slovakia

Abstract

Effect of high temperature which influences nanocrystalline Fe90Zr7B3 NANOPERM alloy during Mössbauer effect examination is investigated. 57Fe Mössbauer spectroscopy was performed in temperature range from 25 to 800 oC upon a nanocrystalline alloy obtained from amorphous precursor by annealing at 515 oC for 1 hour. Using Mössbauer parameters obtained from high temperature (HT) spectra, development of structure and microstructure including dynamic processes is described as a function of temperature. Room temperature Mössbauer spectra collected after each HT experiment unveiled progressing crystallization and formation of new crystalline phases when the temperature of measurement has exceeded the onset of the first and the second crystallization step, respectively. Impact of multiple thermal treatments was studied upon sample annealed at 505 oC. Structural changes obtained after repeated annealing for 5 times 1 hour are compared with those after one 5-hour thermal treatment at the same temperature. Though the final stages of both heating scenarios are almost the same, the evolvement of structure towards higher contents of nanocrystalline phase is observed after each repeated 1-hour annealing..

Keywords

Mössbauer spectrometry, Nanocrystalline alloys, Temperature measurements.

Submitted at: Sept. 5, 2006
Accepted at: Sept. 13, 2006

Citation

M. MIGLIERINI, Evolution of structure and microstructure of nanoperm nanocrystalline alloy with temperature, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 5, pp. 1651-1655 (2006)