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Solid state transformations in Fe-Ni supercooled alloys

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Abstract

The effect of supercooled microstructures and composition in the solid state transformation of the Fe-Ni system was investigated utilizing transmission electron microscopy (TEM), and scanning electron microscopy (SEM). Irrespective of the supercooling degree, Fe-Ni samples containing between 7 and 28 wt % Ni underwent a martensitic transformation above room temperature. The martensite morphology is superimposed on the sub-grain microstructure obtained by supercooling. Indications exist that alternative nucleation is activated if the samples are supercooled below the δ-T0 curve. The impact of alternative nucleation on the martensitic transformation is discussed. Coherent precipitation was observed in Fe-33 wt % Ni alloys. The precipitate dimensions depend on the solidification path. The results are discussed in terms of current supercooling theories.

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Authors and Affiliations

  1. Nuclear Research Centre-Negev, P.O. Box 9001, Beer-Sheva, Israel

    A. Munitz

  2. Ben-Gorion University, Beer-Sheva, Israel

    M. Talyanker

  3. University of Florida, 32611, Gainesville, Florida, USA

    G. J. Abbaschian

Authors
  1. A. Munitz
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  2. M. Talyanker
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  3. G. J. Abbaschian
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Munitz, A., Talyanker, M. & Abbaschian, G.J. Solid state transformations in Fe-Ni supercooled alloys. J Mater Sci 26, 5195–5202 (1991). https://doi.org/10.1007/BF01143213

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  • DOI: https://doi.org/10.1007/BF01143213

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