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Kinetics of phase decomposition accompanied by precipitation of sigma-phasein a Fe73.7Cr26.3 alloy isothermally annealed at 832 K was studied by means ofM\"ossbauer spectroscopy. Two stage decomposition process has been revealed bythree different quantities viz. the average hyperfine field, <H>, theshort-range parameter, alpha1, and the probability of atomic configuration withno Cr atoms within the first two coordination shells around the probe Fe atoms,P(0,0). The first stage, that has terminated after ca.300 h of annealing, hasbeen associated with the decomposition into Fe-rich phase in which theconcentration of Cr, determined as 20.9 at.%, can be interpreted as the borderof the metastable miscibility gap at 832 K. The second stage can be regarded asa continuation of the phase decomposition process combined with a precipitationof sigma. The three relevant parameters for this stage have alsosaturation-like behavior vs. annealing time and the saturation can beinterpreted as termination of the two processes. The concentration of Cr in theFe-rich phase has been determined as 19.8 at.% and this value can be regardedas the limit of Cr solubility in iron at 832 K. Both stages of the kineticswere found to be in line with the Johnson-Mehl-Avrami-Kolgomorov equationyielding values of the rate constant and the Avrami exponent. The activationenergy of the second-stage process was determined to be by ca.12 kJ/mol higher.

Kinetics of phase separation, border of miscibility gap in Fe-Cr and limit of Cr solubility in iron at 832 K