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  The hidden structure dependence of the chemical life of dislocations

Zhou, X., Mianroodi, J. R., Kwiatkowski da Silva, A., Koenig, T., Thompson, G. B., Shanthraj, P., et al. (2021). The hidden structure dependence of the chemical life of dislocations. Science Advances, 7(16): eabf0563. doi:10.1126/sciadv.abf0563.

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The hidden structure dependence of the chemical life of dislocations - sciadv.pdf (Publisher version), 3MB
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 Creators:
Zhou, Xuyang1, Author              
Mianroodi, Jaber Rezaei2, 3, Author              
Kwiatkowski da Silva, Alisson4, Author              
Koenig, Thomas5, Author              
Thompson, Gregory B.6, Author              
Shanthraj, Pratheek7, Author              
Ponge, Dirk8, Author              
Gault, Baptiste1, 9, Author              
Svendsen, Bob4, 10, Author              
Raabe, Dierk4, Author              
Affiliations:
1Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863384              
2Theory and Simulation, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863392              
3Material Mechanics, RWTH Aachen University, Schinkelstr. 2, Aachen, Germany, ou_persistent22              
4Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
5Department of Metallurgical & Materials Engineering, The University of Alabama, 35401 Tuscaloosa, USA, ou_persistent22              
6Department of Metallurgical and Materials Engineering, The University of Alabama, Tuscaloosa, AL, USA, ou_persistent22              
7The School of Materials, The University of Manchester, Manchester M13 9PL, UK, ou_persistent22              
8Mechanism-based Alloy Design, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863383              
9Imperial College, Royal School of Mines, Department of Materials, London, SW7 2AZ, UK, ou_persistent22              
10Material Mechanics, Faculty of Georesources and Materials Engineering, RWTH Aachen University, Schinkelstraße 2, D-52062 Aachen, Germany, ou_persistent22              

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Free keywords: Binary alloys; Defects; Platinum alloys, Advanced materials; Lattice distortions; Material behavior; Material chemistry; Mechanical response; Nano-scale design; Solute segregation; Spatial variations, Gold alloys
 Abstract: Dislocations are one-dimensional defects in crystals, enabling their deformation, mechanical response, and transport properties. Less well known is their influence on material chemistry. The severe lattice distortion at these defects drives solute segregation to them, resulting in strong, localized spatial variations in chemistry that determine microstructure and material behavior. Recent advances in atomic-scale characterization methods have made it possible to quantitatively resolve defect types and segregation chemistry. As shown here for a Pt-Au model alloy, we observe a wide range of defect-specific solute (Au) decoration patterns of much greater variety and complexity than expected from the Cottrell cloud picture. The solute decoration of the dislocations can be up to half an order of magnitude higher than expected from classical theory, and the differences are determined by their structure, mutual alignment, and distortion field. This opens up pathways to use dislocations for the compositional and structural nanoscale design of advanced materials. © 2021 American Association for the Advancement of Science. All rights reserved.

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 Dates: 2021-04-14
 Publication Status: Published in print
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 Identifiers: DOI: 10.1126/sciadv.abf0563
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Title: Science Advances
  Other : Sci. Adv.
Source Genre: Journal
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Publ. Info: Washington : AAAS
Pages: - Volume / Issue: 7 (16) Sequence Number: eabf0563 Start / End Page: - Identifier: ISSN: 2375-2548
CoNE: https://pure.mpg.de/cone/journals/resource/2375-2548