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  On the atomic solute diffusional mechanisms during compressive creep deformation of a Co–Al–W–Ta single crystal superalloy

He, J., Zenk, C. H., Zhou, X., Neumeier, S., Raabe, D., Gault, B., et al. (2020). On the atomic solute diffusional mechanisms during compressive creep deformation of a Co–Al–W–Ta single crystal superalloy. Acta Materialia, 184, 86-99. doi:10.1016/j.actamat.2019.11.035.

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 Creators:
He, Junyang1, Author              
Zenk, Christopher H.2, Author              
Zhou, Xuyang1, Author              
Neumeier, Steffen2, Author              
Raabe, Dierk3, Author              
Gault, Baptiste1, 4, Author              
Makineni, Surendra Kumar1, Author              
Affiliations:
1Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863384              
2Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Materials Science and Engineering, Institute i, Martensstr. 5, 91058 Erlangen, Germany, ou_persistent22              
3Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
4Imperial College, Royal School of Mines, Department of Materials, London, SW7 2AZ, UK, ou_persistent22              

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Free keywords: Aluminum alloys; Atoms; Blending; Cobalt alloys; Crystal atomic structure; Crystal orientation; Diffusion in solids; High resolution transmission electron microscopy; Probes; Shear bands; Single crystals; Superalloys; Tantalum alloys; Transmission electron microscopy, Atom probe tomography; Co-based superalloys; Compressive creep; Correlative approaches; Creep deformations; Diffusional mechanisms; Geometrically close-packed phasis; Single crystal superalloys, Creep
 Abstract: We investigated the solute diffusional behavior active during compressive creep deformation at 150 MPa / 975 °C of a Co-Al-W-Ta single crystal superalloy in the [001] orientation. We report the formation of shear-bands that involves re-orientation of γ/γʹ rafts to 111} from {001 planes, referring to as γ/γ′ raft-rotation. In the shear-band regions, we observed abundant micro-twins, stacking faults (SFs), disordered zones within the γʹ termed as ‘γ pockets’ and also few geometrically-close-packed (GCP) phases. We used a correlative approach blending electron microscopy and atom probe tomography to characterize the structure and composition of these features. The SFs were identified as intrinsic and exhibit a W enrichment up to 14.5 at. and an Al deficiency down to 5.1 at., with respect to the surrounding γʹ phase. The micro-twin boundaries show a solute enrichment similar to the SFs with a distinct W compositional profile gradients perpendicular from the boundaries into the twin interior, indicating solute diffusion within the micro-twins. The γ-pockets have a composition close to that of γ but richer in W/Ta. Based on these observations, we propose (i) a solute diffusion mechanism taking place during micro-twinning, (ii) a mechanism for the γ/γʹ raft-rotation process and evaluate their influence on the overall creep deformation of the present Co-based superalloy. © 2019

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Language(s): eng - English
 Dates: 2020-02-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.actamat.2019.11.035
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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: 184 Sequence Number: - Start / End Page: 86 - 99 Identifier: ISSN: 1359-6454
CoNE: https://pure.mpg.de/cone/journals/resource/954928603100