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Title: Measurements of stress fields near a grain boundary: Exploring blocked arrays of dislocations in 3D

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.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1392141
Alternate Identifier(s):
OSTI ID: 1196378
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Published Article
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Name: Acta Materialia Journal Volume: 96 Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DAXM; HR-EBSD; slip band; grain boundary; hall-petch coefficient

Citation Formats

Guo, Y., Collins, D. M., Tarleton, E., Hofmann, F., Tischler, J., Liu, W., Xu, R., Wilkinson, A. J., and Britton, T. B. Measurements of stress fields near a grain boundary: Exploring blocked arrays of dislocations in 3D. United States: N. p., 2015. Web. doi:10.1016/j.actamat.2015.05.041.
Guo, Y., Collins, D. M., Tarleton, E., Hofmann, F., Tischler, J., Liu, W., Xu, R., Wilkinson, A. J., & Britton, T. B. Measurements of stress fields near a grain boundary: Exploring blocked arrays of dislocations in 3D. United States. https://doi.org/10.1016/j.actamat.2015.05.041
Guo, Y., Collins, D. M., Tarleton, E., Hofmann, F., Tischler, J., Liu, W., Xu, R., Wilkinson, A. J., and Britton, T. B. Tue . "Measurements of stress fields near a grain boundary: Exploring blocked arrays of dislocations in 3D". United States. https://doi.org/10.1016/j.actamat.2015.05.041.
@article{osti_1392141,
title = {Measurements of stress fields near a grain boundary: Exploring blocked arrays of dislocations in 3D},
author = {Guo, Y. and Collins, D. M. and Tarleton, E. and Hofmann, F. and Tischler, J. and Liu, W. and Xu, R. and Wilkinson, A. J. and Britton, T. B.},
abstractNote = {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.},
doi = {10.1016/j.actamat.2015.05.041},
journal = {Acta Materialia},
number = C,
volume = 96,
place = {United States},
year = {Tue Sep 01 00:00:00 EDT 2015},
month = {Tue Sep 01 00:00:00 EDT 2015}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1016/j.actamat.2015.05.041

Citation Metrics:
Cited by: 56 works
Citation information provided by
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Figures / Tables:

Fig. 1 Fig. 1: Tensile specimen design. Thickness of the samples were cut to 2 mm but the actual thickness of the final test piece varies depending on the polishing process. The thickness of the specimen used for this investigation was ~1.5 mm.

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Works referencing / citing this record:

Crystal Indentation Hardness
journal, January 2017

  • Armstrong, Ronald; Walley, Stephen; Elban, Wayne
  • Crystals, Vol. 7, Issue 1
  • DOI: 10.3390/cryst7010021

Interaction of dislocation pile-up with a low-angle tilt boundary: a discrete dislocation dynamics study
journal, December 2016


Alignment of sample position and rotation during in situ synchrotron X-ray micro-diffraction experiments using a Laue cross-correlation approach
journal, September 2019

  • Zhang, Chenglu; Zhang, Yubin; Wu, Guilin
  • Journal of Applied Crystallography, Vol. 52, Issue 5
  • DOI: 10.1107/s1600576719010562

Intragranular three-dimensional stress tensor fields in plastically deformed polycrystals
journal, December 2019


Short-wavelength free-electron laser sources and science: a review
text, January 2017

  • Seddon, E. A.; Clarke, J. A.; Dunning, D. J.
  • Deutsches Elektronen-Synchrotron, DESY, Hamburg
  • DOI: 10.3204/pubdb-2018-00596

Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.