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Atom-probe microanalysis of a nickel-base superalloy

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Abstract

A FIM atom-probe has been used to investigate the phase compositions in a Nb-Mo bearing nickel based superalloy. The composition of γ′ precipitates in fully heat-treated conditions was found to vary with their mean sizes. The matrix analyses revealed the presence of fine secondary precipitates (30 to 100 Å) which occupy 10 pct of the overall volume of the material. The high spatial resolution of the atom-probe allowed the γ-γ′ interface characterization. Composition profiles show that the transition between the phases occurs within one interplanar spacing. Finally, a long range order study of the ordered γ′ phase has been performed. The analysis of the L12 type (Ni, X)3 (Al, Y) precipitates, made on an atomic plane-by-plane basis, shows how alloying elements substitute for Ni and Al in the γ′ sublattice. The observed results, expressed in terms of occupancy probabilities for both types of sites, indicate that Ti, Nb, and Mo preferentially occupy Al sites while Cr and Co substitute for Ni.

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Authors and Affiliations

  1. Unité Associeé au CNRS 808, Faculté des Sciences de Rouen B. P. 67, 76130, Mont Saint Aignan, France

    D. Blavette (Research Scientist), A. Bostel (Research Engineer) & J. M. Sarrau (Assistant Professor)

Authors
  1. D. Blavette
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  2. A. Bostel
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  3. J. M. Sarrau
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Blavette, D., Bostel, A. & Sarrau, J.M. Atom-probe microanalysis of a nickel-base superalloy. Metall Trans A 16, 1703–1711 (1985). https://doi.org/10.1007/BF02670358

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  • DOI: https://doi.org/10.1007/BF02670358

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