Improved grain mapping by laboratory X-ray diffraction contrast tomography
Autor: | D. Juul Jensen, Hai-Xing Fang, Yubin Zhang |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Diffraction
Materials science 3d grain mapping magnified geometries Magnification 02 engineering and technology 010403 inorganic & nuclear chemistry 01 natural sciences Biochemistry law.invention Optics law diffraction contrast tomography General Materials Science Diffraction contrast tomography Image resolution spatial resolution detection limits Ground truth Spatial resolution Crystallography business.industry General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Research Papers Synchrotron 0104 chemical sciences X-ray diffraction x-ray diffraction QD901-999 X-ray crystallography 3D grain mapping Detection limits Crystallite Tomography 0210 nano-technology business Magnified geometries |
Zdroj: | IUCrJ, Vol 8, Iss 4, Pp 559-573 (2021) IUCrJ Fang, H, Jensen, D J & Zhang, Y 2021, ' Improved grain mapping by laboratory X-ray diffraction contrast tomography ', I U Cr J, vol. 8, pp. 559-573 . https://doi.org/10.1107/S2052252521003730 'IUCrJ ', vol: 8, pages: 559-573 (2021) |
ISSN: | 2052-2525 |
DOI: | 10.1107/S2052252521003730 |
Popis: | The present laboratory diffraction contrast tomography suffers from poor spatial resolution – only grains larger than 40 µm can be reliably imaged. In this work, it is shown how this serious limitation can be lifted and the spatial resolution improved significantly. Laboratory diffraction contrast tomography (LabDCT) is a novel technique for non-destructive imaging of the grain structure within polycrystalline samples. To further broaden the use of this technique to a wider range of materials, both the spatial resolution and detection limit achieved in the commonly used Laue focusing geometry have to be improved. In this work, the possibility of improving both grain indexing and shape reconstruction was investigated by increasing the sample-to-detector distance to facilitate geometrical magnification of diffraction spots in the LabDCT projections. LabDCT grain reconstructions of a fully recrystallized iron sample, obtained in the conventional Laue focusing geometry and in a magnified geometry, are compared to one characterized by synchrotron X-ray diffraction contrast tomography, with the latter serving as the ground truth. It is shown that grain indexing can be significantly improved in the magnified geometry. It is also found that the magnified geometry improves the spatial resolution and the accuracy of the reconstructed grain shapes. The improvement is shown to be more evident for grains smaller than 40 µm than for larger grains. The underlying reasons are clarified by comparing spot features for different LabDCT datasets using a forward simulation tool. |
Databáze: | OpenAIRE |
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