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

Florian Vogel, Nelia Wanderka (), Zoltan Balogh, Mohammed Ibrahim, Patrick Stender, Guido Schmitz and John Banhart
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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

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: 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.

Date: 2013
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DOI: 10.1038/ncomms3955

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