Study of a sigma-phase formation in an equiatomic Fe-V alloy

Kinetics of the α- to σ-phase transformation in an equiatomic Fe-V alloy has been studied by Moessbauer Spectroscopy and X-ray diffraction. The B2 superstructure seems to form prior to the precipitation of the σ-phase. The results obtained in this study give evidence that in the investigated interval, the transformation kinetics strongly depends on temperature. The kinetics of the α- to σ-phase transformation, as determined from the temperature dependence of the average hyperfine field derived from the Moessbauer spectra, has been quantitatively described in terms of the Johnson-Mehl-Avrami equation, from which the kinetics parameters n and k have been determined.