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  Hidden Effects of Negative Stacking Fault Energies in Complex Concentrated Alloys

Pei, Z., Dutta, B., Körmann, F., & Chen, M. (2021). Hidden Effects of Negative Stacking Fault Energies in Complex Concentrated Alloys. Physical Review Letters, 126(25): 255502. doi:10.1103/PhysRevLett.126.255502.

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 Creators:
Pei, Zongrui1, Author              
Dutta, Biswanath2, Author              
Körmann, Fritz3, 4, Author              
Chen, Mingwei5, Author              
Affiliations:
1Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA, ou_persistent22              
2Materials Science and Engineering, Delft University of Technology, Mekeleweg 2, 2628 CD Delft, The Netherlands, ou_persistent22              
3Computational Phase Studies, Computational Materials Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863341              
4Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands, ou_persistent22              
5Department of Materials Science and Engineering, Johns Hopkins University, Baltimore Maryland 21218, USA, ou_persistent22              

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Free keywords: High-entropy alloys, Face-centered cubic; Hexagonal close packed; In-situ observations; Low temperatures; Nano-scale deformation; Physical pictures; Shockley partials; Stacking fault energies, Stacking faults
 Abstract: Negative stacking fault energies (SFEs) are found in face-centered cubic high-entropy alloys with excellent mechanical properties, especially at low temperatures. Their roles remain elusive due to the lack of in situ observation of nanoscale deformation. Here, the polymorphism of Shockley partials is fully explored, assisted by a new method. We show negative SFEs result in novel partial pairs as if they were in hexagonal close-packed alloys. The associated yield stresses are much higher than those for other mechanisms at low temperatures. This generalizes the physical picture for all negative-SFE alloys. © 2021 American Physical Society.

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 Dates: 2021-06
 Publication Status: Published in print
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevLett.126.255502
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 126 (25) Sequence Number: 255502 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1