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Title: Characterization and application of Bragg-edge transmission imaging for strain measurement and crystallographic analysis on the IMAT beamline
Authors: Ramadhan, R
Kockelmann, W
Minniti, T
Chen, B
Parfitt, D
Fitzpatrick, M
Tremsin, A
First Published: 30-Jan-2019
Publisher: International Union of Crystallography, Wiley
Citation: Journal of Applied Crystallography, 2019, 52, pp. 351-368
Abstract: This paper presents a series of experiments to characterize the performance of the new IMAT beamline at the ISIS pulsed neutron source and provides examples to showcase the potential applications of Bragg-edge transmission imaging on the instrument. The characterization includes determination of the IMAT spectral and spatial resolutions through calibration measurements, and also determination of the precision and the accuracy of Bragg-edge analysis for lattice parameters of ceramics, metals and textured engineering alloys through high-temperature measurements. A novel Bragg-edge analysis method based on the cross-correlation of different Bragg edges has been developed to provide an estimate of the change in lattice parameter, which is especially useful for measurements of textured samples. Three different applications of the Bragg-edge transmission imaging technique are presented, including strain mapping, texture mapping and obtaining crystallographic information, i.e. the dependence on temperature of the Debye–Waller factor. The experimental results demonstrate the ability of the IMAT beamline to provide accurate strain measurements with uncertainties as low as 90 µ[epsilon] with reasonable measurement time, while characteristic materials parameters can be mapped across the sample with a spatial resolution of 300–600 µm for a strain map and down to ∼90 µm for a texture map.
DOI Link: 10.1107/S1600576719001730
ISSN: 0021-8898
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2019, International Union of Crystallography, Wiley. Deposited with reference to the publisher’s open access archiving policy. (
Appears in Collections:Published Articles, Dept. of Engineering

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