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  In situ observation of dislocation nucleation and escape in a submicrometre aluminium single crystal

Oh, S. H., Legros, M., Kiener, D., & Dehm, G. (2009). In situ observation of dislocation nucleation and escape in a submicrometre aluminium single crystal. Nature Materials, 8(2), 95-100. doi:10.1038/NMAT2370.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-55DA-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-AFDA-5
Genre: Journal Article

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Oh, Sang Ho1, 2, Author              
Legros, Marc3, Author              
Kiener, Daniel2, Author              
Dehm, Gerhard2, 4, 5, Author              
Affiliations:
1Division of Electron Microscopic Research, Korea Basic Science Institute, 52 Eoeun-dong, Daejeon 305-333, South Korea, ou_persistent22              
2Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Austria, ou_persistent22              
3CEMES-CNRS, 29 rue J. Marvig, 31055 Toulouse, France, ou_persistent22              
4Department of Materials Physics, Montanuniversität Leoben, Austria, ou_persistent22              
5Department of Chemistry and Biochemistry, University of Munich, Butenandtstr. 5-13 (E), 81377 Munich, Germany, ou_persistent22              

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 Abstract: ‘Smaller is stronger’ does not hold true only for nanocrystalline materials1 but also for single crystals2–5. It is argued that this effect is caused by geometrical constraints on the nucleation and motion of dislocations in submicrometre-sized crystals6,7. Here, we report the first in situ transmission electron microscopy tensile tests of a submicrometre aluminium single crystal that are capable of providing direct insight into sourcecontrolled dislocation plasticity in a submicrometre crystal. Single-ended sources emit dislocations that escape the crystal before being able to multiply. As dislocation nucleation and loss rates are counterbalanced at about 0.2 events per second, the dislocation density remains statistically constant throughout the deformation at strain rates of about 10-4 s-1. However, a sudden increase in strain rate to 10-3 s-1 causes a noticeable surge in dislocation density as the nucleation rate outweighs the loss rate. This observation indicates that the deformation of submicrometre crystals is strain-rate sensitive.

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Language(s): eng - English
 Dates: 2009-02
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: DOI: 10.1038/NMAT2370
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Title: Nature Materials
  Abbreviation : Nat. Mater.
Source Genre: Journal
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Publ. Info: London, UK : Nature Pub. Group
Pages: - Volume / Issue: 8 (2) Sequence Number: - Start / End Page: 95 - 100 Identifier: ISSN: 1476-1122
CoNE: https://pure.mpg.de/cone/journals/resource/111054835734000