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On the assessment of creep damage evolution in nickel-based superalloys through correlative HR-EBSD and cECCI studies

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Li,  Zhuangming
Microscopy and Diffraction, Microstructure Physics and Alloy Design, 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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Haghighat,  Seyed Masood Hafez
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;
Physical Metallurgy of Sustainable Alloys, Interdepartmental and Partner Groups, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Reed,  Roger Charles
Computational Materials Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Sulzer, S., Li, Z., Zaefferer, S., Haghighat, S. M. H., Wilkinson, A. J., Raabe, D., et al. (2020). On the assessment of creep damage evolution in nickel-based superalloys through correlative HR-EBSD and cECCI studies. Acta Materialia, 185, 13-27. doi:10.1016/j.actamat.2019.07.018.


Cite as: http://hdl.handle.net/21.11116/0000-0009-2C8B-A
Abstract
The evolution of dislocation density with creep strain in single-crystal superalloys is studied quantitatively using high-resolution electron backscatter diffraction (HR-EBSD) and electron channelling contrast imaging under controlled diffraction conditions (cECCI). Data regarding dislocation density/structure is measured for deformation at 900 °C and 450 MPa up to  ≈  1% plastic strain. Effects of chemical composition are elucidated via three purpose-designed superalloys of differing rhenium and ruthenium contents. The evidence indicates that dislocation avalanching is already prevalent at plastic strains of  ≈  0.1%; thereafter, an exponential decay in the dislocation multiplication rate is indicative of self-hardening due to dislocation constriction within the matrix channels, as confirmed by the imaging. The results are rationalised using discrete dislocation dynamics modelling: a universal dislocation evolution law emerges, which will be useful for alloy design efforts.