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Phase separation in strained and strain-free samples of Fe84.85Cr15.15induced by an isothermal annealing at 402 deg C up to 3888 h was studied bymeans of the Mossbauer spectroscopy. The measured Fe-site spectra were analyzedwith two different procedures viz. a hyperfine field distribution and atwo-shell superposition methods. Information relevant to the kinetics of theseparation process, concentration of Cr in Fe-rich phase, short-range orderingand magnetic texture was obtained based on values of spectral parameters. Inparticular, the following quantities pertinent to the kinetics were found: theactivation energy, equal to 1666 kJ per mol for the strained sample, and to1388 kJ per mol for the strain-relaxed one, the Avrami exponent n=2.5(2) forboth samples, the rate constant equal to 0.0011(1) for the strained and to0.0028(1) per hour for the strained-free samples, respectively. Theconcentration of Cr in the Fe-rich phase was revealed to be 11.6(4) at. % forthe strained sample, and to 13.2(4) at.% for the strain-free one. Significantdifferences in the values of the short-range parameters were revealed for thetwo samples. An average angle between the magnetization vector and the normalto the sample surface was equal to 52.7 deg for the strained sample, and to57.5 deg for the strain-relaxed one.

Phase decomposition in an Fe-Cr alloy at 402 deg C: M\"ossbauer spectroscopic study