Polychromatic diffraction contrast tomography

• Published in: Materials characterization Vol. 97; pp. 1 - 10
• Main Authors: King, A., Reischig, P., Adrien, J., Peetermans, S., Ludwig, W.
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Inc 01-11-2014; Elsevier
• Subjects: COLD NEUTRONS; COMPARATIVE EVALUATIONS; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Cross-disciplinary physics: materials science; rheology; DATA ACQUISITION; Diffraction; Diffraction contrast tomography; Exact sciences and technology; Grains; Laboratory X-rays; MAPPING; MATERIALS SCIENCE; Mechanics; Mechanics of materials; Neutron imaging; NEUTRON SOURCES; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Polychromatic radiation; Polycrystalline characterization; POLYCRYSTALS; Solidification; SYNCHROTRON RADIATION SOURCES; Synchrotrons; Three dimensional; TOMOGRAPHY; X RADIATION; X-RAY DIFFRACTION; X-RAY SOURCES; X-rays; Diffraction contrast tomography; Laboratory X-rays; Neutron imaging; Polychromatic radiation; Polycrystalline characterization; Imaging
• ISSN: 1044-5803; 1873-4189
• DOI: 10.1016/j.matchar.2014.07.026

This tutorial review introduces the use of polychromatic radiation for 3D grain mapping using X-ray diffraction contrast tomography. The objective is to produce a 3D map of the grain shapes and orientations within a bulk, millimeter-sized polycrystalline sample. The use of polychromatic radiation enables the standard synchrotron X-ray technique to be applied in a wider range of contexts: 1) Using laboratory X-ray sources allows a much wider application of the diffraction contrast tomography technique. 2) Neutron sources allow large samples, or samples containing high Z elements to be studied. 3) Applied to synchrotron sources, smaller samples may be treated, or faster measurements may be possible. Challenges and particularities in the data acquisition and processing, and the limitations of the different variants, are discussed.
•We present a tutorial review of polychromatic diffraction contrast tomography techniques.•The use of polychromatic radiation allows the standard synchrotron DCT technique to be extended to a range of other sources.•The characteristics and limitations of all variants of the techniques are derived, discussed and compared.•Examples using laboratory X-ray and cold neutron radiation are presented.•Suggestions for the future development of these techniques are presented.