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Kinetics of sigma-phase formation in equiatomic cold-rolled Fe-V alloys

Authors: B.F.O. Costa, J. Cieslak and S. M. Dubiel

Ref.: Materials Chemitry and Physics 143, 19-25 (2013)

Abstract: The kinetics of alpha-to-sigma phase transformation in equiatomic Fe-V cold-rolled alloys was studied by the Mossbauer spectroscopy (MS) and X-ray diffraction (XRD) techniques. The kinetics could be well-described in terms of the Johnson-Mehl-Avrami-Kolmogorov type equation. The activation energy has been determined as being 189 kJ mol(-1) and the Avrami exponent as close to 3. The sigma-phase precipitation rate was found to be the highest at 800 degrees C. Prior to the formation of the sigma-phase the ordered B2 phase was revealed, as a precursor of sigma, by both MS and XRD techniques. (C) 2013 Elsevier B.V. All rights reserved.

DOI: 10.1016/j.matchemphys.2013.07.020