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On the diffusive phase transformation mechanism assisted by extended dislocations during creep of a single crystal CoNi-based superalloy

MPS-Authors
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Makineni,  Surendra Kumar
Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Kumar,  A.
Department of NMR Based Structural Biology, MPI for biophysical chemistry, Max Planck Society;
Research Group of Solid-State NMR, MPI for biophysical chemistry, Max Planck Society;
Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany; Institute of Micro- and Nanostructure Research Center for Nanoanalysis and Electron Microscopy (CENEM), Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstraße 6, Erlangen, Germany; Institute of General Materials Properties, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstr. 1, Erlangen, Germany; Institut für Werkstoffe, Ruhr-Universität Bochum, Universitätsstrasse 150, Bochum, Germany;

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Kontis,  Paraskevas
Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Meiners,  Thorsten
Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Zaefferer,  Stefan
Microscopy and Diffraction, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Raabe,  Dierk
Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Gault,  Baptiste
Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Makineni, S. K., Kumar, A., Lenz, M., Kontis, P., Meiners, T., Zenk, C. H., et al. (2018). On the diffusive phase transformation mechanism assisted by extended dislocations during creep of a single crystal CoNi-based superalloy. Acta Materialia, 155, 362-371. doi:10.1016/j.actamat.2018.05.074.


Cite as: http://hdl.handle.net/21.11116/0000-0001-E633-2
Abstract
We propose here a deformation-induced diffusive phase transformation mechanism occurring during shearing of γ′ ordered phase in a γ/γ′ single crystalline CoNi-based superalloy. Shearing involved the creation and motion of a high density of planar imperfections. Through correlative electron microscopy and atom probe tomography, we captured a superlattice intrinsic stacking fault (SISF) and its associated moving leading partial dislocation (LPD). The structure and composition of these imperfections reveal characteristic chemical – structural contrast. The SISF locally exhibits a D019 ordered structure coherently embedded in the L12 γ′ and enriched in W and Co. Interestingly, the LPD is enriched with Cr and Co, while the adjoining planes ahead of the LPD are enriched with Al. Quantitative analysis of the three-dimensional compositional field in the vicinity of imperfections sheds light onto a new in-plane diffusion mechanism as the LPD moves on specific 111 planes upon application of stress at high temperature. © 2018 Acta Materialia Inc.