title: Three-dimensional full-field X-ray orientation microscopy.
abstract: A previously introduced mathematical framework for full-field X-ray orientation microscopy is for the first time applied to experimental near-field diffraction data acquired from a polycrystalline sample. Grain by grain tomographic reconstructions using convex optimization and prior knowledge are carried out in a six-dimensional representation of position-orientation space, used for modelling the inverse problem of X-ray orientation imaging. From the 6D reconstruction output we derive 3D orientation maps, which are then assembled into a common sample volume. The obtained 3D orientation map is compared to an EBSD surface map and local misorientations, as well as remaining discrepancies in grain boundary positions are quantified. The new approach replaces the single orientation reconstruction scheme behind X-ray diffraction contrast tomography and extends the applicability of this diffraction imaging technique to material micro-structures exhibiting sub-grains and/or intra-granular orientation spreads of up to a few degrees. As demonstrated on textured sub-regions of the sample, the new framework can be extended to operate on experimental raw data, thereby bypassing the concept of orientation indexation based on diffraction spot peak positions. This new method enables fast, three-dimensional characterization with isotropic spatial resolution, suitable for time-lapse observations of grain microstructures evolving as a function of applied strain or temperature.
authors: MATEIS, INSA Lyon, CNRS (UMR5510), Univ. Lyon, F-69621 Lyon, France.|ESRF, The European Synchrotron, F-38043 Grenoble, France.|University of Antwerp, iMinds-Vision Lab, B-2610 Antwerp, Belgium.
authors: Nicola
authors: N
authors: Viganò
authors: LMS, Ecole Polytechnique, CNRS (UMR7649), Université Paris-Saclay, 91128 Palaiseau, France.
authors: Alexandre
authors: A
authors: Tanguy
authors: LMS, Ecole Polytechnique, CNRS (UMR7649), Université Paris-Saclay, 91128 Palaiseau, France.
authors: Simon
authors: S
authors: Hallais
authors: LMS, Ecole Polytechnique, CNRS (UMR7649), Université Paris-Saclay, 91128 Palaiseau, France.
authors: Alexandre
authors: A
authors: Dimanov
authors: Univ. Paris-Est, Laboratoire Navier, ENPC, CNRS UMR8205, IFSTTAR, F-77455 Marne-la-Vallée, France.
authors: Michel
authors: M
authors: Bornert
authors: University of Antwerp, iMinds-Vision Lab, B-2610 Antwerp, Belgium.|Centrum Wiskunde &Informatica, Amsterdam, 1098 XG Amsterdam, The Netherlands.|University of Leiden, Mathematical Institute, 2300 RA Leiden, The Netherlands.
authors: Kees Joost
authors: KJ
authors: Batenburg
authors: MATEIS, INSA Lyon, CNRS (UMR5510), Univ. Lyon, F-69621 Lyon, France.|ESRF, The European Synchrotron, F-38043 Grenoble, France.
authors: Wolfgang
authors: W
authors: Ludwig