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Grain segmentation in atomistic simulations using orientation-based iterative self-organizing data analysis
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DOI：10.1016/j.mtla.2022.101314.png)
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Abstract
En 中文
Atomistic simulations have now established themselves as an indispensable tool in understanding deformation mechanisms of materials at the atomic scale. Large scale simulations are regularly used to study the behavior of polycrystalline materials at the nanoscale. In this work, we propose a method for grain segmentation of an atomistic configuration using an unsupervised machine learning algorithm that clusters atoms into individual grains based on their orientation. The proposed method, called the Or IsoDATA algorithm, is based on the iterative self-organizing data analysis technique and is modified to work in the orientation space. The working of the algorithm is demonstrated on a 122 grain nanocrystalline thin film sample in both undeformed and deformed states. The Or IsoDATA algorithm is also compared with two other grain segmentation algorithms available in the open-source visualization tool OvITo . The results show that the Or IsoDATA algorithm is able to correctly identify deformation twins as well as regions separated by low angle grain boundaries. The model parameters have intuitive physical meaning and relate to similar thresholds used in experiments, which not only helps obtain optimal values but also facilitates easy interpretation and validation of results.
Keywords:
Atomistic simulations
Unsupervised machine learning
Orientation-based IsoDATA clustering
Grain segmentation
Graph clustering
Minimum spanning tree