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

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.

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 Creators:
Sulzer, Sabin1, Author              
Li, Zhuangming2, Author              
Zaefferer, Stefan2, Author              
Haghighat, Seyed Masood Hafez3, Author              
Wilkinson, Angus J.4, Author              
Raabe, Dierk3, 5, Author              
Reed, Roger Charles6, Author              
Affiliations:
1Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK, ou_persistent22              
2Microscopy and Diffraction, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863391              
3Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
4Department of Materials, University of Oxford, Parks Road, OX1 3PH Oxford, UK, ou_persistent22              
5Physical Metallurgy of Sustainable Alloys, Interdepartmental and Partner Groups, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_3289784              
6Computational Materials Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863337              

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Free keywords: Nickel-based single-crystal superalloys, Creep damage, High-resolution electron backscatter diffraction (HR-EBSD), Electron channelling contrast imaging (ECCI), Discrete dislocation dynamics (DDD)
 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.

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Language(s): eng - English
 Dates: 2020-02-15
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.actamat.2019.07.018
 Degree: -

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Title: Acta Materialia
  Abbreviation : Acta Mater.
Source Genre: Journal
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Publ. Info: Kidlington : Elsevier Science
Pages: - Volume / Issue: 185 Sequence Number: - Start / End Page: 13 - 27 Identifier: ISSN: 1359-6454
CoNE: https://pure.mpg.de/cone/journals/resource/954928603100