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  Deformation mechanisms, activated slip systems and critical resolved shear stresses in an Mg-LPSO alloy studied by micro-pillar compression

Chen, R., Sandlöbes, S., Zehnder, C., Zeng, X., Korte-Kerzel, S., & Raabe, D. (2018). Deformation mechanisms, activated slip systems and critical resolved shear stresses in an Mg-LPSO alloy studied by micro-pillar compression. Materials and Design, 154, 203-216. doi:10.1016/j.matdes.2018.05.037.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-E644-F Version Permalink: http://hdl.handle.net/21.11116/0000-0001-E645-E
Genre: Journal Article

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 Creators:
Chen, Ran1, 2, Author              
Sandlöbes, Stefanie2, 3, Author              
Zehnder, Christoffer3, Author              
Zeng, Xiaoqin1, Author              
Korte-Kerzel, Sandra4, Author              
Raabe, Dierk2, Author              
Affiliations:
1The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 200240 Shanghai, PR China, persistent22              
2Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
3Institute of Physical Metallurgy and Metal Physics, RWTH Aachen University, 52056 Aachen, Germany, ou_persistent22              
4Institut für Metallkunde und Metallphysik, RWTH Aachen University, Aachen 52074, Germany, ou_persistent22              

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Free keywords: Crystal orientation; Crystalline materials; Deformation; High resolution transmission electron microscopy; Shear stress; Ternary alloys; Transmission electron microscopy; Zinc alloys, Critical resolved shear stress; Crystallographic orientations; Deformation mechanism; Electron back scatter diffraction; Longperiod stacking ordered structure (LPSO); Micro-pillar compressions; Plastic anisotropy; Transmission electron, Magnesium alloys
 Abstract: We study the micro-mechanical behaviour of single-crystalline long-period-stacking ordered (LPSO) structures, α-Mg and bi-crystalline Mg/LPSO micro-pillars, all cut from the same Mg97Y2Zn1 (at.) alloy. To investigate the deformation and co-deformation mechanisms of Mg-LPSO alloys we performed micro-pillar compression experiments with micro-pillars of an orientation inclined by 7°, 46° and 90° to (0001) orientation, respectively. Electron backscatter diffraction-assisted slip trace analysis and post-mortem transmission electron microscopy analysis showed predominant deformation by basal 〈a〉 dislocation slip in 46°(0001) and 7°(0001) oriented micro-pillars. In 7°(0001) oriented micro-pillars additional non-basal dislocation slip and the formation of micro shear bands along pyramidal planes were activated in the α-Mg and the LPSO structure, respectively. In 90°(0001) oriented micro-pillars 11¯001¯1¯20 prismatic slip was predominantly activated during the early deformation stages. The relative magnitude of the critical stresses depends on the crystal phase as well as the crystallographic orientation, i.e. the activated slip system. Specifically, basal 〈a〉 slip has the lowest critical resolved shear stress in both, α-Mg and the LPSO structure, while the CRSS of prismatic 〈a〉 slip is about 5 times higher than basal 〈a〉 slip in α-Mg and about 15 times higher than basal 〈a〉 slip in LPSO. © 2018 Elsevier Ltd

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Language(s): eng - English
 Dates: 2018-09-15
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.matdes.2018.05.037
BibTex Citekey: Chen2018203
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Title: Materials and Design
  Other : Materials & Design
  Abbreviation : Mater. Des.
Source Genre: Journal
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Publ. Info: Reigate, Surrey, Eng. : Elsevier
Pages: - Volume / Issue: 154 Sequence Number: - Start / End Page: 203 - 216 Identifier: ISSN: 0264-1275
CoNE: /journals/resource/954926234428