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  Atomistic deformation behavior of single and twin crystalline Cu nanopillars with preexisting dislocations

Ko, W.-S., Stukowski, A., Hadian, R., Nematollahi, G. A., Jeon, J. B., Choi, W. S., et al. (2020). Atomistic deformation behavior of single and twin crystalline Cu nanopillars with preexisting dislocations. Acta Materialia, 197, 54-68. doi:10.1016/j.actamat.2020.07.029.

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 Creators:
Ko, Won-Seok1, Author              
Stukowski, Alexander2, Author
Hadian, Raheleh3, Author              
Nematollahi, Gholamali Ali3, Author              
Jeon, Jong Bae4, Author              
Choi, Won Seok5, Author              
Dehm, Gerhard6, Author              
Neugebauer, Jörg7, Author              
Kirchlechner, Christoph8, 9, Author              
Grabowski, Blazej10, Author              
Affiliations:
1School of Materials Science and Engineering, University of Ulsan, 44610 Ulsan, Republic of Korea, ou_persistent22              
2School of Materials Science and Engineering, University of Ulsan, Ulsan, 44610, South Korea; Department of Materials Science, Technical University of Darmstadt, Darmstadt, 64289, Germany; Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Str. 1, Düsseldorf, 40237, Germany; Advanced Surface Coating and Processing RD Group, Korea Institute for Industrial Technology, Busan, 46938, South Korea; Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, South Korea; Institute for Applied Materials, Karlsruhe Institute of Technology, Karlsruhe, Germany; Institute of Materials Science, University of Stuttgart, Pfaffenwaldring 55, Stuttgart, 70569, Germany, ou_persistent22              
3Adaptive Structural Materials (Simulation), Computational Materials Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863339              
4Energy Component and Materials R&D Group, Dongnam Regional Division, Korea Institute of Industrial Technology, 1274 Jisa-dong, Gangseo-Gu, Busan 618-230, South Korea, ou_persistent22              
5Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Korea, ou_persistent22              
6Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863398              
7Computational Materials Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863337              
8Nano-/ Micromechanics of Materials, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863401              
9Institute for Applied Materials (IAM-WBM), Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen D-76344, Germany, ou_persistent22              
10Institute of Materials Science, University of Stuttgart, Pfaffenwaldring 55, Stuttgart, 70569, Germany, ou_persistent22              

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Free keywords: Molecular dynamics; Plastic flow, Atomistic deformation; Dislocation networks; Dislocation sources; Dislocation starvations; Inverse correlation; Mechanical response; Molecular dynamics simulations; Plastic deformation behavior, Nanopillars
 Abstract: Molecular dynamics simulations are performed to investigate the impact of a coherent Σ3 (111) twin boundary on the plastic deformation behavior of Cu nanopillars. Our work reveals that the mechanical response of pillars with and without the twin boundary is decisively driven by the characteristics of initial dislocation sources. In the condition of comparably large pillar size and abundant initial mobile dislocations, overall yield and flow stresses are controlled by the longest, available mobile dislocation. An inverse correlation of the yield and flow stresses with the length of the longest dislocation is established and compared to experimental data. The experimentally reported subtle differences in yield and flow stresses between pillars with and without the twin boundary are likely related to the maximum lengths of the mobile dislocations. In the condition of comparably small pillar size, for which a reduction of mobile dislocations during heat treatment and mechanical loading occurs, the mechanical response of pillars with and without the twin boundary can be clearly distinguished. Dislocation starvation during deformation is more pronounced in pillars without the twin boundary than in pillars with the twin boundary because the twin boundary acts as a pinning surface for the dislocation network. © 2020 Acta Materialia Inc.

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Language(s): eng - English
 Dates: 2020-09-15
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.actamat.2020.07.029
 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: 197 Sequence Number: - Start / End Page: 54 - 68 Identifier: ISSN: 1359-6454
CoNE: https://pure.mpg.de/cone/journals/resource/954928603100