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Mapping the evolution of hierarchical microstructures in a Ni-based superalloy

Author

Listed:
  • Florian Vogel

    (Institute of Applied Materials, Helmholtz-Zentrum Berlin)

  • Nelia Wanderka

    (Institute of Applied Materials, Helmholtz-Zentrum Berlin)

  • Zoltan Balogh

    (Institute of Materials Physics, University of Münster)

  • Mohammed Ibrahim

    (Institute of Materials Physics, University of Münster)

  • Patrick Stender

    (Institute of Materials Physics, University of Münster)

  • Guido Schmitz

    (Institute of Materials Physics, University of Münster)

  • John Banhart

    (Institute of Applied Materials, Helmholtz-Zentrum Berlin
    Technische Universität Berlin)

Abstract

Phase separation of γ′ precipitates determines the microstructure and mechanical properties of nickel-based superalloys. In the course of ageing, disordered γ spheres form inside ordered (L12) γ′ precipitates, undergo a morphological change to plates and finally split the γ′ precipitates. The presence of γ particles inside γ′ affects coarsening kinetics and increases alloy hardness. Here we use atom probe tomography to visualize phase separation in a Ni86.1Al8.5Ti5.4 alloy in three dimensions and to quantify the composition of all the phases with near-atomic resolution. We find that γ′ precipitates are supersaturated in nickel, thereby driving the formation of γ particles and observe a compositional evolution of the γ particles, which accompanies their morphological change. Our results suggest that by controlling nickel supersaturation we can tailor the phase separation and thereby the properties of nickel-based superalloys.

Suggested Citation

  • Florian Vogel & Nelia Wanderka & Zoltan Balogh & Mohammed Ibrahim & Patrick Stender & Guido Schmitz & John Banhart, 2013. "Mapping the evolution of hierarchical microstructures in a Ni-based superalloy," Nature Communications, Nature, vol. 4(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3955
    DOI: 10.1038/ncomms3955
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