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Using differential scanning calorimetry, we have examined the effect of isotopic composition on the temperature and kinetics of the α → γ phase transition of isotopically natural (natFe), 56Fe-enriched, and 57Fe-enriched Fe samples and assessed kinetic phase transition parameters as functions of isotopic disorder parameter. A time–temperature–transition diagram is presented for the fraction of the γ-phase resulting from the α → γ phase transition. [ABSTRACT FROM AUTHOR]

The linear thermal expansion coefficients (LTECs) of isotopically natural Fe (natFe) and samples isotopically enriched in 56Fe (99.945 wt %) and 57Fe (90.954 wt %) have been determined as functions of temperature by X-ray diffraction dilatometry in the temperature range 173–433 K. The low-temperature LTEC of 57Fe has been shown to be larger. As the temperature is raised to the range 368–433 K, the difference between the LTECs of the samples differing in isotopic composition decreases. [ABSTRACT FROM AUTHOR]