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The electron metallography of ordering reactions in Fe-Al alloys

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Abstract

The microstructural changes during the α→ FeAl, FeAl → Fe3Al, and α→ Fe3Al transitions were studied by transmission electron microscopy. The ordering of ferromagnetic α was observed to occur in a classical manner by the nucleation and growth of particles of the FeAl or Fe3Al type phases. However, the ordering of paramagnetic α to FeAl and paramagnetic FeAl to Fe3Al occurred by a mechanism which showed many of the characteristics expected of a second or higher degree transition. These included critical point fluctuations in the degree of long-range order which also appeared to be greater in the vicinity of antiphase domain boundaries. The FeAl phase was also observed to partially disorder in the initial stages of the FeAl → α + FeAl transition and this effect appears to account for the anomalous magnetic behavior of some FeAl alloys.

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Authors and Affiliations

  1. Department of Metallurgy, Imperial College, London, England

    P. R. Swann

  2. Fundamental Research Laboratory, U. S. Steel Corp. Research Center, Monroeville, Pa

    W. R. Duff & R. M. Fisher

Authors
  1. P. R. Swann
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  2. W. R. Duff
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  3. R. M. Fisher
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Swann, P.R., Duff, W.R. & Fisher, R.M. The electron metallography of ordering reactions in Fe-Al alloys. Metall Trans 3, 413–423 (1972). https://doi.org/10.1007/BF02642045

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  • DOI: https://doi.org/10.1007/BF02642045

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