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

1
Université de Lorraine – CNRS – Arts et Métiers ParisTech – LEM3, 7 rue Félix Savart, 57070 Metz, France
2
Laboratory of Excellence on Design of Alloy Metals for low-mAss Structures (DAMAS) – Université de Lorraine, 57073 Metz, France
*
Author to whom correspondence should be addressed.
Materials 2019, 12(10), 1587; https://doi.org/10.3390/ma12101587
Received: 26 April 2019 / Revised: 9 May 2019 / Accepted: 13 May 2019 / Published: 15 May 2019
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Abstract

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. View Full-Text
Keywords: ECCI; dislocation contrast; modeled intensity profiles; invisibility criteria; dynamical theory of electron diffraction ECCI; dislocation contrast; modeled intensity profiles; invisibility criteria; dynamical theory of electron diffraction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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KRIAA, H.; GUITTON, A.; MALOUFI, N. Modeling Dislocation Contrasts Obtained by Accurate-Electron Channeling Contrast Imaging for Characterizing Deformation Mechanisms in Bulk Materials. Materials 2019, 12, 1587.

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