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Spinodal decomposition in the Fe−Cr system

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Abstract

Fe−Cr binary alloys ranging from 20 to 50 pct Cr have been analyzed by Mössbauer spectroscopy, in the queached state and after aging respectively at 470° and 540°C. A clear distinction could be made in this way between the nucleation and growth, and the spinodal process of decomposition during aging. When the alloy lies inside of the miscibility gap but outside of the spinodal, a pramagnetic precipitate clearly appears right from the beginning of the aging process, while when the alloy lies inside of the spinodal, no paramagnetic phase appears even after 1050 hr of aging at 470°C. This certainly indicates that the spinodal decomposition is very slow. One more point is shown: aging outside of the miscibility gap shows clearly a clustering of the chromium atoms and a large departure from the concept of an ideal solid solution.

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Author information

Authors and Affiliations

  1. Vieille Montagne S.A., Balen-Neet, Belgium

    T. de Nys (Engineer)

  2. Laboratoire de Métallurgie Physique, University of Louvain, Belgium

    P. M. Gielen (is Chargé de Cours)

Authors
  1. T. de Nys
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  2. P. M. Gielen
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Additional information

T. DE NYS, formerly Graduate Student, University of Louvain, 3030 Heverlee, Belgium.

This work is based on a thesis submitted by T. DE NYS in partial fulfillment of the requirements of the degree of Engineer in Physics at the University of Louvain.

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de Nys, T., Gielen, P.M. Spinodal decomposition in the Fe−Cr system. Metall Trans 2, 1423–1428 (1971). https://doi.org/10.1007/BF02913370

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