81Poster Award NomineePoster Award NomineeP5-01Simulation of Diffractive Electron Lenses Using Monte Carlo Method Bo DACenter for Basic Research on Materials, National Institute for Materials Science (NIMS) Recently, Emanuel M. Avrahami et al. [1] reported that complex morphologies of biogenic crystals emerge from anisotropic growth of symmetry-related facets, demonstrating that the rotating crystal derives from asymmetric growth of symmetrically related crystallographic planes. Here, we present an even more interesting asymmetric crystal growth structure: the cylindrical symmetric rotating crystal (CSRC) [2]. The CSRC simultaneously exhibits island morphology in real space and Kikuchi diffraction patterns in momentum space in the raster scan mode of scanning electron microscopy. This new experimental observation suggests a potential mechanism beyond current diffraction theories.For example, a CSRC could be designed to make the diffracted bright spots converge to the same point when the electron beam is incident on any position of the material. In this manner, it would be possible to produce a micron-scale electron lens, which is much smaller than current meter-scale electromagnetic lenses, and would facilitate development of portable electron microscopes. This will undoubtedly be of great significance to both materials characterization and industry. A CSRC thus provides broad opportunities for developing electronic components, and its application potential warrants further investigation. [1] Emanuel M. Avrahami et al., Science, 376, 312–316 (2022). [2] B. Da et al., Science and Technology of Advanced Materials: Methods, 3:1 (2023). P5-02Computational Simulation of Material Behavior Using Image-based Finite Element Modeling Ikumu Watanabe1,2 and Tianwen Tan1,21 Center for Basic Research on Materials, National Institute for Materials Science (NIMS) 2 Graduate School of Science and Technology, University of Tsukuba Computational simulations are invaluable for studying the connection between material behavior and heterogeneous microstructure. The finite element (FE) method, with its ability to discretize domains into finite elements, is particularly adept at capturing complex heterogeneities. Nevertheless, constructing a computationally efficient FE model that accurately represents the actual microstructure remains a significant challenge. Furthermore, determining the local properties of individual constituents within the microstructure can be problematic. To address these limitations, various approaches have been proposed [1, 2]. In this paper, we present a case study demonstrating the application of these approaches to create an FE model based on an experimentally observed three-dimensional microstructure. [1] I. Watanabe and A. Yamanaka, Int. Jour. Mech. Sci., 150, 314 (2019). [2] T. Chen and I. Watanabe, Sci. Tech. Adv. Mater. Meth., 2, 416 (2022).
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