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Diffraction contrast tomography (DCT)(1)(2), is a novel X-ray imaging technique which allows for simultaneous 3D characterization of a material's absorption and grain microstructure. Applicable to the case of plastically undeformed, polycrystalline mono and multiphase materials, up to several hundreds grains can be imaged using the occasionally occurring diffraction contribution to the X-ray attenuation coefficient (Fig1). An automatized analysis procedure allows pairing the observed diffraction spots with the corresponding extinction contrast in the direct beam. Based on spatial as well as crystallographic constraints, the spot pairs are then sorted into sets, belonging to the same grain. Finally, the 3D grain shapes as well as the crystallographic grain orientations are reconstructed from these subsets. (Fig.2, Fig.3) Figure 1. Overview of the acquisition geometry for diffraction contrast tomography. The footprint of the direct beam (light gray) fills only part of the field of the 2D detector system, which is set close to the sample in order to capture diffraction and absorption information, simultaneously.

materia

Simultaneous Characterization of the Absorption and Grain Microstructure in Undeformed Polycrystalline Materials by Synchrotron Radiation X-ray Diffraction Contrast Tomography