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Title: Stereographic Methods for 3D Characterization of Dislocations

Abstract

A computer program has been developed to extract three dimensional information of dislocations, interfaces, and precipitates/ cavities from two transmission electron microcopy (TEM) images.

Authors:
 [1];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). MST-8: Materials Science in Radiation and Dynamic Extremes
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1375876
Report Number(s):
LA-UR-17-21331
Journal ID: ISSN 1431-9276; applab
Grant/Contract Number:
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Microscopy and Microanalysis
Additional Journal Information:
Journal Volume: 23; Journal Issue: S1; Conference: Microscopy & Microanalysis ; 2017-08-06 - 2017-08-10 ; St. Louis, Missouri, United States; Journal ID: ISSN 1431-9276
Publisher:
Microscopy Society of America (MSA)
Country of Publication:
United States
Language:
English
Subject:
97 MATHEMATICS AND COMPUTING

Citation Formats

Eftink, Ben P., Gray, George T., and Maloy, Stuart A.. Stereographic Methods for 3D Characterization of Dislocations. United States: N. p., 2017. Web. doi:10.1017/S1431927617001738.
Eftink, Ben P., Gray, George T., & Maloy, Stuart A.. Stereographic Methods for 3D Characterization of Dislocations. United States. doi:10.1017/S1431927617001738.
Eftink, Ben P., Gray, George T., and Maloy, Stuart A.. Fri . "Stereographic Methods for 3D Characterization of Dislocations". United States. doi:10.1017/S1431927617001738.
@article{osti_1375876,
title = {Stereographic Methods for 3D Characterization of Dislocations},
author = {Eftink, Ben P. and Gray, George T. and Maloy, Stuart A.},
abstractNote = {A computer program has been developed to extract three dimensional information of dislocations, interfaces, and precipitates/ cavities from two transmission electron microcopy (TEM) images.},
doi = {10.1017/S1431927617001738},
journal = {Microscopy and Microanalysis},
number = S1,
volume = 23,
place = {United States},
year = {Fri Aug 04 00:00:00 EDT 2017},
month = {Fri Aug 04 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on August 4, 2018
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  • 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 throughmore » 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.« less
  • 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 throughmore » 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.« less
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