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Comprehensive characterization of dislocations by Electron Channeling Contrast Imaging in SEM: Practical and fundamental aspects

Abstract : In Scanning Electron Microscope (SEM), Electron Channeling Contrast Imaging (ECCI) is a nondestructive diffraction-based technique that allows direct observation and comprehensive characterization of crystalline defects on bulk samples [1]. ECCI takes advantage from the strong dependence between the backscattred electrons intensity and the crystal orientation relative to the incident electron beam. Defects, such as dislocations, can be imaged with a visibility of depth below the surface of about a hundred nanometers (the same order of magnitude of the thickness of a TEM thin foil). It has been shown that a fine control of the channeling conditions is absolutely required to get strong contrast generated by these linear defects [2]. In this work, fundamental and experimental aspects of electron diffraction for characterizing dislocations by ECCI are reported. Interpretation of contrast in (g,-g) and its evolution along Kikuchi band are given [3]. Experimentally, the potentiality of this technique is explored to study the evolution of the TiAl alloys microstructure before and after deformation at room temperature [4]. References [1]Mansour, H., Guyon, J., Crimp, M.A., Gey, N., Beausira, B., Maloufi, N. Scripta. Mater. 84–85 (2014) 11–14. [2]Mansour, H., Crimp, M.A., Gey, N., Maloufi, N. Scripta. Mater. 109 (2015) 76–79. [3]Kriaa, H., Guitton, A., Maloufi, N. Scientific Reports.7 (2017) 9742. [4]Guitton, A., Kriaa, H., Bouzy, E., Guyon, J., Maloufi, N. Materials.
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https://hal.univ-lorraine.fr/hal-03043035
Contributor : Antoine Guitton <>
Submitted on : Monday, December 7, 2020 - 9:56:42 AM
Last modification on : Friday, January 15, 2021 - 3:00:06 PM

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  • HAL Id : hal-03043035, version 1

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Hana Kriaa, Antoine Guitton, Nabila Maloufi. Comprehensive characterization of dislocations by Electron Channeling Contrast Imaging in SEM: Practical and fundamental aspects. EUROMAT, 2017, Thessaloniki, Greece. ⟨hal-03043035⟩

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