ORCID Profile
0000-0003-4432-7681
Current Organisation
Japan Atomic Energy Agency
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Publisher: Springer Science and Business Media LLC
Date: 25-08-2017
DOI: 10.1038/S41598-017-09717-W
Abstract: The physical properties of polycrystalline materials depend on their microstructure, which is the nano- to centimeter scale arrangement of phases and defects in their interior. Such microstructure depends on the shape, crystallographic phase and orientation, and interfacing of the grains constituting the material. This article presents a new non-destructive 3D technique to study centimeter-sized bulk s les with a spatial resolution of hundred micrometers: time-of-flight three-dimensional neutron diffraction (ToF 3DND). Compared to existing analogous X-ray diffraction techniques, ToF 3DND enables studies of s les that can be both larger in size and made of heavier elements. Moreover, ToF 3DND facilitates the use of complicated s le environments. The basic ToF 3DND setup, utilizing an imaging detector with high spatial and temporal resolution, can easily be implemented at a time-of-flight neutron beamline. The technique was developed and tested with data collected at the Materials and Life Science Experimental Facility of the Japan Proton Accelerator Complex (J-PARC) for an iron s le. We successfully reconstructed the shape of 108 grains and developed an indexing procedure. The reconstruction algorithms have been validated by reconstructing two stacked Co-Ni-Ga single crystals, and by comparison with a grain map obtained by post-mortem electron backscatter diffraction (EBSD).
Publisher: SAGE Publications
Date: 30-09-2020
Abstract: Energy resolved neutron transmission techniques can provide high-resolution images of strain within polycrystalline s les allowing the study of residual strain and stress in engineered components. Strain is estimated from such data by analysing features known as Bragg-edges for which several methods exist. It is important for these methods to provide both accurate estimates of strain and an accurate quantification the associated uncertainty. Our contribution is twofold. First, we present a numerical simulation analysis of these existing methods, which shows that the most accurate estimates of strain are provided by a method that provides inaccurate estimates of certainty. Second, a novel Bayesian non-parametric method for estimating strain from Bragg-edges is presented. The numerical simulation analysis indicates that this method provides both competitive estimates of strain and accurate quantification of certainty, two demonstrations on experimental data are then presented.
Publisher: American Physical Society (APS)
Date: 09-10-2017
Publisher: American Physical Society (APS)
Date: 13-12-2018
Publisher: IOP Publishing
Date: 09-2016
Publisher: American Physical Society (APS)
Date: 26-11-2019
No related grants have been discovered for Takenao Shinohara.