An efficient method to improve the spatial resolution of laboratory X-ray diffraction contrast tomography: Paper

H. Fang*, D. Juul Jensen, Y. Zhang

*Corresponding author for this work

Research output: Contribution to journalConference articleResearchpeer-review

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Abstract

Lab-based diffraction contrast tomography (LabDCT) has recently enabled nondestructive 3D characterization of the crystallographic orientations and grain morphologies in bulk materials. Despite the wide accessibility and availability of lab-based X-rays, the current spatial resolution of LabDCT is only about 20 μm and has to be improved to make this technique a more versatile tool. Conventional LabDCT takes advantage of the Laue focusing effect, i.e. the diffracted beam from a sample illuminated by an incoming polychromatic beam, is focused when the source and the detector are symmetrically positioned. In this study we have investigated the possibility of increasing the spatial resolution of LabDCT by placing the detector at a distance beyond that required for Laue focusing. We first developed a forward projection simulation tool to elucidate the effects of placing the detector at a larger distance. Next, we performed LabDCT measurements on a partially recrystallized pure aluminum sample at different sample-to-detector distances. The results show that the diffraction spots can be magnified by a factor of about three compared to the current LabDCT setup. The benefits and limitations resulting from increasing the sample-to-detector distance are discussed.
Original languageEnglish
Article number012030
JournalI O P Conference Series: Materials Science and Engineering
Volume580
Issue number1
Number of pages6
ISSN1757-8981
DOIs
Publication statusPublished - 2019
Event40th Risø International Symposium on Material Science: Metal Microstructures in 2D, 3D, and 4D - Roskilde, Denmark
Duration: 2 Sep 20196 Sep 2019

Conference

Conference40th Risø International Symposium on Material Science: Metal Microstructures in 2D, 3D, and 4D
Country/TerritoryDenmark
CityRoskilde
Period02/09/201906/09/2019

Bibliographical note

GA no. 788567

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