Characterization of Crystallographic Structures Using Bragg-Edge Neutron Imaging at the Spallation Neutron Source
| Autor: | Ke An, Jeffrey R. Bunn, Harley D. Skorpenske, Christopher A. Tulk, Anton S. Tremsin, J.C. Bilheux, Gian Song, Jiao Y. Y. Lin, Jamie J. Molaison, Louis J. Santodonato, Qingge Xie, Ryan R. Dehoff, Hassina Z. Bilheux, Michael M. Kirka, Antonio M. dos Santos, Alexandru D. Stoica, Lindsay M. Sochalski-Kolbus |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Inconel 718 Gaussian Neutron diffraction crystallographic characterization 02 engineering and technology Crystal structure Neutron scattering wavelength-dependent neutron radiography lcsh:Computer applications to medicine. Medical informatics 01 natural sciences lcsh:QA75.5-76.95 symbols.namesake Lattice constant 0103 physical sciences Radiology Nuclear Medicine and imaging Bragg-edge imaging lcsh:Photography Electrical and Electronic Engineering 010302 applied physics Neutron imaging Oak Ridge National Laboratory lcsh:TR1-1050 021001 nanoscience & nanotechnology Computer Graphics and Computer-Aided Design Crystallography symbols lcsh:R858-859.7 additive manufacturing lcsh:Electronic computers. Computer science Computer Vision and Pattern Recognition 0210 nano-technology Spallation Neutron Source |
| Zdroj: | Journal of Imaging; Volume 3; Issue 4; Pages: 65 Journal of Imaging, Vol 3, Iss 4, p 65 (2017) |
| ISSN: | 2313-433X |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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