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  Deformation patterns in cross-sections of twisted bamboo-structured Au microwires

Ziemann, M., Chen, Y., Wulfinghoff, S., Kirchlechner, C., Tamura, N., Böhlke, T., et al. (2015). Deformation patterns in cross-sections of twisted bamboo-structured Au microwires. Acta Materialia, 97: 12194, pp. 216-222. doi:10.1016/j.actamat.2015.06.012.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-5C6A-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-5C6D-4
Genre: Journal Article

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 Creators:
Ziemann, M.1, Author              
Chen, Ying1, Author              
Wulfinghoff, Stephan2, Author              
Kirchlechner, Christoph3, 4, Author              
Tamura, Nobumichi5, Author              
Böhlke, Thomas6, Author              
Walter, Michael H.1, Author              
Gruber, Patric Alfons1, Author              
Affiliations:
1Karlsruhe Institute of Technology, Institute for Applied Materials, Engelbert-Arnold-Strasse 4, Karlsruhe, Germany, ou_persistent22              
2Institute of Applied Mechanics, RWTH Aachen University, D-52074 Aachen, Germany, ou_persistent22              
3Nano-/ Micromechanics of Materials, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863401              
4Department of Materials Physics, Montanuniversität Leoben, Austria, ou_persistent22              
5Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, USA, ou_persistent22              
6Karlsruhe Institute of Technology (KIT), Department of Continuum Mechanics, Karlsruhe, Germany, ou_persistent22              

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Free keywords: Crystal plasticity; Deformation patterns; Equivalent plastic strain; Laue microdiffraction; Microtorsion; Strain gradients
 Abstract: Abstract In order to investigate an almost pure extrinsic size effect we propose an experimental approach to investigate the deformation structure within single crystalline cross-sections of twisted bamboo-structured Au microwires. The cross-sections of individual <100> oriented grains of 25 μm thick Au microwires have been characterized by Laue microdiffraction. The diffraction data were used to calculate the misorientation of each data point with respect to the neutral fiber in the center of the cross-section as well as the kernel average misorientation to map the global and local deformation structure as function of the imposed maximum plastic shear strain. The study is accompanied by crystal plasticity simulations which yield the equivalent plastic strain distributions in the cross-section of the wire. The global deformation structures are directly related to the activated slip systems, resulting from the real orientations of the investigated grains. When averaging the degree of deformation along ring segments, an almost continuous but non-linear increase of misorientation from the center toward the surface is observed, reflecting the overall strain gradient imposed by torsion. For the local deformation structure, pronounced and graded deformation traces are observed which often pass over the neutral fiber of the twisted wire and which are obviously reflecting domains of high geometrically necessary dislocations content. © 2015 Acta Materialia Inc.

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Language(s): eng - English
 Dates: 2015-07-14
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1016/j.actamat.2015.06.012
 Degree: -

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Title: Acta Materialia
  Abbreviation : Acta Mater.
Source Genre: Journal
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Publ. Info: Tarrytown, NY : Pergamon
Pages: - Volume / Issue: 97 Sequence Number: 12194 Start / End Page: 216 - 222 Identifier: ISSN: 1359-6454
CoNE: /journals/resource/954928603100