Measurements of stress fields near a grain boundary: exploring blocked arrays of dislocations in 3D
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Published version
Author(s)
Type
Journal Article
Abstract
The interaction between dislocation pile-ups and grain boundaries gives rise to heterogeneous stress distributions when a structural metal is subjected to mechanical loading. Such stress heterogeneity leads to preferential sites for damage nucleation and therefore is intrinsically linked to the strength and ductility of polycrystalline metals. To date the majority of conclusions have been drawn from 2D experimental investigations at the sample surface, allowing only incomplete observations. Our purpose here is to significantly advance the understanding of such problems by providing quantitative measurements of the effects of dislocation pile up and grain boundary interactions in 3D. This is accomplished through the application of differential aperture X-ray Laue micro-diffraction (DAXM) and high angular resolution electron backscatter diffraction (HR-EBSD) techniques. Our analysis demonstrates a similar strain characterization capability between DAXM and HR-EBSD and the variation of stress intensity in 3D reveals that different parts of the same grain boundary may have different strengths in resisting slip transfer, likely due to the local grain boundary curvature.
Date Issued
2015-06-24
Date Acceptance
2015-05-25
Citation
Acta Materialia, 2015, 96, pp.229-236
ISSN
1873-2453
Publisher
Elsevier
Start Page
229
End Page
236
Journal / Book Title
Acta Materialia
Volume
96
Copyright Statement
2015 Acta Materialia Inc. Published by Elsevier Ltd. This is an open access article under the CC BY license
(http://creativecommons.org/licenses/by/4.0/).
(http://creativecommons.org/licenses/by/4.0/).
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Royal Academy Of Engineering
Grant Number
EP/K034332/1
RF/129
Subjects
Science & Technology
Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
DAXM
HR-EBSD
Slip band
Grain boundary
Hall-Petch coefficient
SLIP TRANSFER MECHANISMS
LATTICE DISLOCATIONS
CHARACTER-DISTRIBUTION
METALS
DEFORMATION
RESOLUTION
FCC
TRANSMISSION
POLYCRYSTALS
NUCLEATION
Materials
0912 Materials Engineering
0913 Mechanical Engineering
Publication Status
Published