期刊
MICROSCOPY AND MICROANALYSIS
卷 -, 期 -, 页码 -出版社
OXFORD UNIV PRESS
DOI: 10.1093/micmic/ozad115
关键词
automated grain boundary detection; bright-field transmission electron microscopy; grain size distribution; machine learning; nanocrystalline thin films
This study successfully demonstrates the application of a machine learning approach for grain boundary detection in bright-field transmission electron micrographs. The proposed methodology combines a U-Net convolutional neural network trained on carefully constructed data with targeted postprocessing algorithms to accurately estimate grain boundary positions and preserve fine features of interest. The technique is validated by comparing with manual tracings and shows promising results for interpreting new microstructures with different image characteristics.
Quantification of microstructures is crucial for understanding processing-structure and structure-property relationships in polycrystalline materials. Delineating grain boundaries in bright-field transmission electron micrographs, however, is challenging due to complex diffraction contrast in images. Conventional edge detection algorithms are inadequate; instead, manual tracing is usually required. This study demonstrates the first successful machine learning approach for grain boundary detection in bright-field transmission electron micrographs. The proposed methodology uses a U-Net convolutional neural network trained on carefully constructed data from bright-field images and hand tracings available from prior studies, combined with targeted postprocessing algorithms to preserve fine features of interest. The image processing pipeline accurately estimates grain boundary positions, avoiding segmentation in regions with intragrain contrast and identifying low-contrast boundaries. Our approach is validated by directly comparing microstructural markers (i.e., grain centroids) identified in U-Net predictions with those identified in hand tracings; furthermore, the grain size distributions obtained from the two techniques show notable overlap when compared using t-test, Kolmogorov-Smirnov test, and Cramer-von Mises test. The technique is then successfully applied to interpret new microstructures having different image characteristics from the training data, with preliminary results from platinum and palladium microstructures presented, highlighting the versatility of our approach for grain boundary identification in bright-field micrographs.
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