Electron tomography: An imaging method for materials deformation dynamics |
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Affiliation: | 1. Department of Advanced Materials Science, Kyushu University, Fukuoka 816-8580, Japan;2. The Ultramicroscopy Research Center, Kyushu University, Fukuoka 819-0395, Japan;3. Department of Energy Science and Engineering, Kyushu University, Fukuoka 819-0395, Japan;4. Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka 816-8580, Japan;5. Monash Centre for Electron Microscopy, Monash University, Clayton, VIC 3800, Australia;6. Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA 24061, USA;7. Reactor Materials and Mechanical Design Group, Energy and Environmental Directorate, Pacific Northwest National Laboratory, WA 99352, USA |
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Abstract: | The combination of in-situ and three-dimensional (3D) in transmission electron microscopy (TEM) is one of the emerging topics of recent advanced electron microscopy research. However, to date, there have been only handful examples of in-situ 3D TEM for material deformation dynamics. In this article, firstly, the authors briefly review technical developments in fast tilt-series dataset acquisition, which is a crucial technique for in-situ electron tomography (ET). Secondly, the authors showcase a recent successful example of in-situ specimen-straining and ET system development and its applications to the deformation dynamics of crystalline materials. The system is designed and developed to explore, in real-time and at sub-microscopic levels, the internal behavior of polycrystalline materials subjected to external stresses, and not specifically targeted for atomic resolution (although it may be possible). Technical challenges toward the in-situ ET observation of 3D dislocation dynamics are discussed for commercial structural crystalline materials, including some of the early studies on in-situ ET imaging and 3D modeling of dislocation dynamics. A short summary of standing technical issues and a proposed guideline for further development in the 3D imaging method for dislocation dynamics are then discussed. |
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Keywords: | Transmission electron microscopy (TEM) Electron tomography (ET) Three-dimensional (3D) Dislocation dynamics Diffraction contrast Plastic deformation |
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