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Characterization of γ and γ′ phases in 2nd and 4th generation single crystal nickel-base superalloys

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Abstract

A Ni based single crystal superalloy from the 2nd generation, PWA 1484, and one from the 4th generation, PWA 1497, were comparatively studied by scanning electron microscopy, energy dispersive X-ray spectroscopy and nanoindentation technique in an atomic force microscope (NI-AFM) after high temperature creep deformation. During primary creep of both generations of superalloys, γ′ precipitates start to coalesce and grow directionally. Further creep deformation leads to the topological inversion and coarsening of the rafted microstructure. The NI-AFM technique was used for measurements of the hardness of the γ and γ′ phases in as-received and creep deformed samples in various conditions. The g matrix of the PWA 1497 superalloy is on average 0.8 GPa harder than that of PWA 1484 that can be explained by higher content of Re and Ru, since they partition predominantly to the matrix phase.

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Authors and Affiliations

  1. International Centre of Electron Microscopy for Materials Science and Faculty of Metals Engineering and Computer Industrial Science, AGH University of Science and Technology (AGH-UST), PL-30 059, Kraków, Poland

    Maciej Zietara & Aleksandra Czyrska-Filemonowicz

  2. Department Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Institute I, 91058, Erlangen, Germany

    Steffen Neumeier & Mathias Göken

Authors
  1. Maciej Zietara
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  2. Steffen Neumeier
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  3. Mathias Göken
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  4. Aleksandra Czyrska-Filemonowicz
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Correspondence to Maciej Zietara.

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Zietara, M., Neumeier, S., Göken, M. et al. Characterization of γ and γ′ phases in 2nd and 4th generation single crystal nickel-base superalloys. Met. Mater. Int. 23, 126–131 (2017). https://doi.org/10.1007/s12540-017-6109-y

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  • DOI: https://doi.org/10.1007/s12540-017-6109-y

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