Recent developments in synchrotron X-ray diffraction imaging
X-ray diffraction contrast tomography [1] is a near-field X-ray diffraction imaging technique enabling simultaneous characterization of (i) microstructural detail visible in absorption contrast (i.e. second phases, porosity, etc…), and (ii) the crystallographic grain microstructure, revealed through analysis of the Bragg diffraction signals. The non-destructive nature of this technique allows for time-resolved 3D microstructural/crystallographic investigations. With the recent upgrade to a six-dimensional reconstruction framework [2] the method now provides access to spatially resolved crystal orientation maps with an orientation resolution comparable to EBSD and a spatial resolution consistent with the voxel size of the high resolution X-ray imaging detectors.
Moreover, like modern electron microscopes, state of the art X-ray diffraction imaging instruments can nowadays offer complementary imaging modalities like phase contrast tomography, X-ray topography [3] and dark-field microscopy [4], the latter two enabling “zoom-in” observations of individual grains at higher spatial resolution. Various examples, illustrating the possibilities and limitations of the outlined multimodal characterization approach for time-lapse observations of plastic deformation, fatigue damage and grain growth will be discussed.
![Figure 1a: EBSD orientation map from the surface of a NaCl polycrystal. Figure 1b: Corresponding slice through the 6D-DCT reconstruction [2]](/3752604/original-1518446953.jpg?t=eyJ3aWR0aCI6ODQ4LCJmaWxlX2V4dGVuc2lvbiI6ImpwZyIsIm9ial9pZCI6Mzc1MjYwNH0%3D--d85ee78f7bc196472faf7e5d79f350e8fe6d942a "Figure 1a: EBSD orientation map from the surface of a NaCl polycrystal. Figure 1b: Corresponding slice through the 6D-DCT reconstruction [2]")
![Figure 1a: EBSD orientation map from the surface of a NaCl polycrystal. Figure 1b: Corresponding slice through the 6D-DCT reconstruction [2]](/3752604/original-1518446953.jpg?t=eyJ3aWR0aCI6MjQ2LCJvYmpfaWQiOjM3NTI2MDR9--445ae8691e8c3e37c508484a29cdbb63f79cde8a)
Figure 1b: Corresponding slice through the 6D-DCT reconstruction [2]
Dr. Wolfgang Ludwig
Laboratiore Materiaux, Ingenierie et Science, MATEIS
INSA Lyon, Université de Lyon, UMR5510 CNRS
INSA Lyon
25 av. J. Capelle
69621 Villeurbanne
France
current address :
ESRF - Euorpean Synchrotron
CS 40220
71, anenue des Martyrs
F-38043 Grenoble
France
| Phone | +33 4 76 88 29 73 |
| Fax | +33 4 76 88 27 07 |
| W. Ludwig-ESRF (Grenoble) ; W. Ludwig-INSA (Lyon) | |
| Http | Project information |
| MATEIS Insa Lyon |