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The segregation of phosphorus to the free surface of a ferritic iron alloy at 723 to 823 K

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Abstract

The isothermal segregation of phosphorus to the free surface of an annealed polycrystalline Fe-Ni-Cr-C alloy, containing 0.06 wt pct P, has been studied by Auger electron spectroscopy between 723 and 823 K using anin situ heating technique. It is found that after high temperature argon-ion bombardment the kinetics of isothermal segregation are consistent with bulk (lattice) diffusion of phosphorus as the rate determining mechanism. An approximate value for the adsorption isotherm constant is deduced to be 8×102 per wt pct by a limited analysis of the kinetic data in terms of linear bulk diffusion with a boundary condition given by an ideal adsorption isotherm.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Science, University of Pennsylvania, 19104, Philadelphia, PA

    A. C. Yen (Post Doctoral Fellow), W. R. Graham (Associate Professor) & G. R. Belton (Professor)

Authors
  1. A. C. Yen
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  2. W. R. Graham
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  3. G. R. Belton
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Yen, A.C., Graham, W.R. & Belton, G.R. The segregation of phosphorus to the free surface of a ferritic iron alloy at 723 to 823 K. Metall Trans A 9, 31–34 (1978). https://doi.org/10.1007/BF02647167

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  • DOI: https://doi.org/10.1007/BF02647167

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