The activation energy for γ-Fe precipitates inCuFe
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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.
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- D.G. Rancourt, S. Chehab and A. Lemarche, J. Magn. Magn. Mater. 78 (1989) in press.Google Scholar
- S.J. Campbell and G.L. Whittle, Hyp. Int. 41 (1988) 551.Google Scholar
- D.K.-H. Finkler, S.J. Campbell, J. Ferreirinho, G.H.J. Wantenaar and U. Gonser, J. Magn. Magn. Mater. 79 (1989) in press.Google Scholar
- D.K.-H. Finkler, A.E. Maurer, S.J. Campbell, T. Heck and U. Gonser, Physica 145B (1987) 335.Google Scholar
- P. Haasen, ‘Physikalische Metallkunde’ (Springer, Berlin, 1974) p. 178.Google Scholar
- P.G. Shewmon, ‘Diffusion in Solids’ (McGraw-Hill, New York, 1963) p. 40.Google Scholar
- J. Klein, S.J. Campbell, F. Aubertin, U. Gonser and O. Schneeweiss(1989) in preparation.Google Scholar