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Improved grain mapping by laboratory X-ray diffraction contrast tomography.

H Fang1, D Juul Jensen1, Y Zhang1

  • 1Department of Mechanical Engineering, Technical University of Denmark, Kgs. Lyngby, 2800, Denmark.

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|July 14, 2021
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Summary
This summary is machine-generated.

Laboratory diffraction contrast tomography (LabDCT) was enhanced using geometrical magnification. This novel approach improves grain indexing, spatial resolution, and shape reconstruction accuracy for polycrystalline materials.

Keywords:
3D grain mappingX-ray diffractiondetection limitsdiffraction contrast tomographymagnified geometriesspatial resolution

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Area of Science:

  • Materials Science
  • Crystallography
  • Non-destructive Testing

Background:

  • Laboratory diffraction contrast tomography (LabDCT) is a novel technique for non-destructive imaging of polycrystalline materials.
  • Current limitations in spatial resolution and detection limit restrict LabDCT's application range.
  • Improving these parameters is crucial for broader material characterization.

Purpose of the Study:

  • To investigate enhancing LabDCT's spatial resolution and detection limit.
  • To improve grain indexing and shape reconstruction accuracy.
  • To assess the impact of geometrical magnification in LabDCT.

Main Methods:

  • Implemented geometrical magnification by increasing sample-to-detector distance in LabDCT.
  • Acquired LabDCT grain reconstructions of a recrystallized iron sample using conventional and magnified Laue focusing geometries.
  • Compared results with synchrotron X-ray diffraction contrast tomography as ground truth.
  • Utilized a forward simulation tool to analyze diffraction spot features.

Main Results:

  • Magnified geometry significantly improved grain indexing accuracy.
  • Enhanced spatial resolution and accuracy of reconstructed grain shapes were observed.
  • Improvements were more pronounced for smaller grains (<40 µm).

Conclusions:

  • Increasing sample-to-detector distance (geometrical magnification) effectively enhances LabDCT performance.
  • The magnified geometry offers superior grain indexing and shape reconstruction.
  • This advancement broadens the applicability of LabDCT for detailed microstructural analysis.