Characterization and application of Bragg-edge transmission imaging for strain measurement and crystallographic analysis on the IMAT beamline

Ranggi S. Ramadhan, Winfried Kockelmann, Triestino Minniti, Bo Chen, David Parfitt, Michael E. Fitzpatrick, Anton S. Tremsin

Research output: Contribution to journalArticle

4 Citations (Scopus)
23 Downloads (Pure)

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 µϵ 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.

Original languageEnglish
Pages (from-to)351-368
Number of pages18
JournalJournal of Applied Crystallography
Volume52
Issue number2
DOIs
Publication statusPublished - 1 Apr 2019

    Fingerprint

Keywords

  • Bragg edges
  • crystallographic texture mapping
  • IMAT
  • neutron imaging
  • strain mapping

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

Cite this