Modeling Dislocation Contrasts Obtained by Accurate-Electron Channeling Contrast Imaging for Characterizing Deformation Mechanisms in Bulk Materials

Electron Channeling Contrast Imaging (ECCI) is becoming a powerful tool in materials science for characterizing deformation defects. Dislocations observed by ECCI in scanning electron microscope exhibit several features depending on the crystal orientation relative to the incident beam (white/black...

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Bibliographic Details
Published in:Materials 2019-05, Vol.12 (10), p.1587
Main Authors: Kriaa, Hana, Guitton, Antoine, Maloufi, Nabila
Format: Article
Language:English
Subjects:
Channeling
Condensed Matter
Crystal defects
Crystal structure
Deformation mechanisms
Diffraction
Diffraction theory
Materials Science
Physics
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Summary:Electron Channeling Contrast Imaging (ECCI) is becoming a powerful tool in materials science for characterizing deformation defects. Dislocations observed by ECCI in scanning electron microscope exhibit several features depending on the crystal orientation relative to the incident beam (white/black line on a dark/bright background). In order to bring new insights concerning these contrasts, we report an original theoretical approach based on the dynamical diffraction theory. Our calculations led, for the first time, to an explicit formulation of the back-scattered intensity as a function of various physical and practical parameters governing the experiment. Intensity profiles are modeled for dislocations parallel to the sample surface for different channeling conditions. All theoretical predictions are consistent with experimental results.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma12101587