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J. Imaging 2017, 3(4), 65; https://doi.org/10.3390/jimaging3040065

Characterization of Crystallographic Structures Using Bragg-Edge Neutron Imaging at the Spallation Neutron Source

1
Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
2
Materials Science and Technology Division, Physical Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
3
Experimental Astrophysics Group, Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA
This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for the purposes of the United States Government. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).
*
Authors to whom correspondence should be addressed.
Received: 10 November 2017 / Revised: 4 December 2017 / Accepted: 7 December 2017 / Published: 20 December 2017
(This article belongs to the Special Issue Neutron Imaging)
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Abstract

Over the past decade, wavelength-dependent neutron radiography, also known as Bragg-edge imaging, has been employed as a non-destructive bulk characterization method due to its sensitivity to coherent elastic neutron scattering that is associated with crystalline structures. Several analysis approaches have been developed to quantitatively determine crystalline orientation, lattice strain, and phase distribution. In this study, we report a systematic investigation of the crystal structures of metallic materials (such as selected textureless powder samples and additively manufactured (AM) Inconel 718 samples), using Bragg-edge imaging at the Oak Ridge National Laboratory (ORNL) Spallation Neutron Source (SNS). Firstly, we have implemented a phenomenological Gaussian-based fitting in a Python-based computer called iBeatles. Secondly, we have developed a model-based approach to analyze Bragg-edge transmission spectra, which allows quantitative determination of the crystallographic attributes. Moreover, neutron diffraction measurements were carried out to validate the Bragg-edge analytical methods. These results demonstrate that the microstructural complexity (in this case, texture) plays a key role in determining the crystallographic parameters (lattice constant or interplanar spacing), which implies that the Bragg-edge image analysis methods must be carefully selected based on the material structures. View Full-Text
Keywords: wavelength-dependent neutron radiography; Bragg-edge imaging; crystallographic characterization; additive manufacturing; Inconel 718 wavelength-dependent neutron radiography; Bragg-edge imaging; crystallographic characterization; additive manufacturing; Inconel 718
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Song, G.; Lin, J.Y.Y.; Bilheux, J.C.; Xie, Q.; Santodonato, L.J.; Molaison, J.J.; Skorpenske, H.D.; M. Dos Santos, A.; Tulk, C.A.; An, K.; Stoica, A.D.; Kirka, M.M.; Dehoff, R.R.; Tremsin, A.S.; Bunn, J.; Sochalski-Kolbus, L.M.; Bilheux, H.Z. Characterization of Crystallographic Structures Using Bragg-Edge Neutron Imaging at the Spallation Neutron Source. J. Imaging 2017, 3, 65.

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