Abstract
We have studied the enthalpy changes in Fe 73.5Cu 1Nb 3Si 13.5B 9 alloy along isothermal DSC runs and performed X-ray diffraction (XRD) on annealed samples. The average grain size of nanograins presents a limit nearly independent of temperature (≈ 12 nm). Modelling of the enthalpy variations was performed and good agreement with experiments is observed in the low temperature range. When the temperature is increased, steady-state nucleation seems to be invalid for long annealing times. A plausible explanation is presented involving the formation of a Nb diffusion layer around the nanograins.
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