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Issue 22, 2014
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Cold neutron diffraction contrast tomography of polycrystalline material

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Abstract

Traditional neutron imaging is based on the attenuation of a neutron beam through scattering and absorption upon traversing a sample of interest. It offers insight into the sample's material distribution at high spatial resolution in a non-destructive way. In this work, it is expanded to include the diffracted neutrons that were ignored so far and obtain a crystallographic distribution (grain mapping). Samples are rotated in a cold neutron beam of limited wavelength band. Projections of the crystallites formed by the neutrons they diffract are captured on a two dimensional imaging detector. Their positions on the detector reveal their orientation whereas the projections themselves are used to reconstruct the shape of the grains. Indebted to established synchrotron diffraction contrast tomography, this ‘cold neutron diffraction contrast tomography’ is performed on recrystallized aluminium for experimental comparison between both. Differences between set-up and method are discussed, followed by the application range in terms of sample properties (crystallite size and number, mosaicity and typical materials). Neutron diffraction contrast tomography allows to study large grains in bulky metallic structures.

Graphical abstract: Cold neutron diffraction contrast tomography of polycrystalline material

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Publication details

The article was received on 13 Aug 2014, accepted on 22 Sep 2014 and first published on 02 Oct 2014


Article type: Paper
DOI: 10.1039/C4AN01490A
Citation: Analyst, 2014,139, 5765-5771
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    Cold neutron diffraction contrast tomography of polycrystalline material

    S. Peetermans, A. King, W. Ludwig, P. Reischig and E. H. Lehmann, Analyst, 2014, 139, 5765
    DOI: 10.1039/C4AN01490A

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