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Time and spatial resolution of slip and twinning in a grain embedded within a magnesium polycrystal

Lynch,PA, Kunz,M, Tamura,N and Barnett,MR 2014, Time and spatial resolution of slip and twinning in a grain embedded within a magnesium polycrystal, Acta Materialia, vol. 78, pp. 203-212, doi: 10.1016/j.actamat.2014.06.030.

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Title Time and spatial resolution of slip and twinning in a grain embedded within a magnesium polycrystal
Author(s) Lynch,PA
Kunz,M
Tamura,N
Barnett,MRORCID iD for Barnett,MR orcid.org/0000-0001-8287-9044
Journal name Acta Materialia
Volume number 78
Start page 203
End page 212
Total pages 10
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2014-10
ISSN 1359-6454
Keyword(s) Magnesium
Polychromatic diffraction
Tensile twinning
Science & Technology
Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
SITU NEUTRON-DIFFRACTION
X-RAY
HCP METALS
DEFORMATION MECHANISMS
ALLOY CRYSTALS
DISLOCATIONS
MG
NUCLEATION
BOUNDARIES
GROWTH
Summary Plastic yielding in magnesium alloys frequently involves the initiation of both slip and twinning events. A proper understanding of the phenomenon at the grain level requires knowledge of how these two mechanisms progress and interact over both time and space and what the local resolved stresses are. To date, simultaneous collection of such information has not been achievable. To address this shortfall, we have developed a modified Laue based in situ micro X-ray diffraction technique with an unprecedented combination of time and spatial resolution. A ten-fold reduction in data collection times is realized by the refinement of rapid polychromatic Laue "single-shot" mapping. From single Laue patterns, we extract grain depth information, detect onset of yielding and achieve 2 × 10-4 lattice strain resolution. The technique is employed to examine yielding and twinning in a magnesium grain embedded ∼200 μm below the sample surface. We examine 13 time steps and reveal the following behaviour: initial onset of basal slip, subsequent onset of twinning, development of further accommodation slip and evolution of twin shape and size; along with the corresponding values of local resolved shear stresses. © 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Language eng
DOI 10.1016/j.actamat.2014.06.030
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 861199 Basic Metal Products (incl. Smelting, Rolling, Drawing and Extruding) not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2014, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30070962

Document type: Journal Article
Collection: Institute for Frontier Materials
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