Metals and Alloys

Hyperfine Interactions

, Volume 54, Issue 1, pp 811-816

First online:

The activation energy for γ-Fe precipitates inCuFe

  • J. KleinAffiliated withFachbereich 12.1, Universität des Saarlandes
  • , T. HeckAffiliated withFachbereich 12.1, Universität des Saarlandes
  • , S. J. CampbellAffiliated withDepartment of Physics, University College, University of New South Wales, ADFA
  • , F. AubertinAffiliated withFachbereich 12.1, Universität des Saarlandes
  • , U. GonserAffiliated withFachbereich 12.1, Universität des Saarlandes

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Abstract

The precipitation of the fcc γ-phase of iron has been studied by a systematic series of isothermal and isochronal (0–48 h) heat treatments (300–800°C) on a supersaturated solution ofCuFe containing 3 at% Fe. The optimal conditions (450–600°C) for precipitation of the maximum fraction (90%) of iron attainable within 48 h in the form of γ-Fe have been delineated from analysis of the room temperature spectra. The time dependence for formation of γ-Fe precipitates is well described by the equation for long term annealing. An activation energyE a ≈0.6 eV for the formation of γ-Fe in Cu is obtained. It indicates short range rather than long range diffusion in theCuFe sample studied.