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  Investigation of reversible plasticity in a micron-sized, single crystalline copper bending beam by X-ray μLaue diffraction

Kirchlechner, C., Grosinger, W., Kapp, M. W., Imrich, P. J., Micha, J.-S., Ulrich, O., et al. (2012). Investigation of reversible plasticity in a micron-sized, single crystalline copper bending beam by X-ray μLaue diffraction. Philosophical Magazine, 92(25-27), 3231-3242. doi:10.1080/14786435.2012.669067.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-001A-1FE3-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-001A-1FE5-6
Genre: Journal Article
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 Creators:
Kirchlechner, C.1, 2, Author              
Grosinger, W.1, 2, Author              
Kapp, M. W.2, Author              
Imrich, P. J.2, Author              
Micha, J.-S.3, 4, Author              
Ulrich, O.3, 4, Author              
Kečkéš, J.1, Author              
Dehm, G.1, 2, Author              
Motz, C.2, Author              
Affiliations:
1Department of Materials Physics, Montanuniversität Leoben, Leoben, Austria, ou_persistent22              
2Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, Austria, ou_persistent22              
3CEA-Grenoble, Institut Nanosciences et Cryogénie, Grenoble, France, ou_persistent22              
4CRG-IF BM32, ESRF, Grenoble, France, ou_persistent22              

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 Abstract: The observed mechanical behaviour of micron-sized samples raises fundamental questions about the influence of size on the underlying dislocation plasticity. In situ mLaue diffraction on a single crystalline copper bending beam was performed to study the feasibility of bending tests and their contribution to our understanding of size-dependent dislocation plasticity. Theoretical considerations lead to a minimum sample size where in situ mLaue experiments are useable. A critical size is evidenced below which, depending on Young’s modulus and maximum stress, the elastic and plastic contributions to the lattice curvature cannot be separated. The experiment shows the increase in geometrically necessary dislocations during plastic deformation followed by a decrease during unloading. This can be explained by the formation and dissolution of a dislocation pile-up at the neutral axis of the bending cantilever. The dissolution of the dislocation pile-up is caused by the back stress of the pile-up and a direct observation of the Bauschinger effect, which is consistent with the non-purely elastic mechanical behaviour when unloading the sample.

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Language(s): eng - English
 Dates: 2012-09-01
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1080/14786435.2012.669067
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Title: Philosophical Magazine
Source Genre: Journal
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Publ. Info: Milton Park, Abingdon, England : Taylor & Francis
Pages: - Volume / Issue: 92 (25-27) Sequence Number: - Start / End Page: 3231 - 3242 Identifier: ISSN: 1478-6435
CoNE: https://pure.mpg.de/cone/journals/resource/954925265237