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Figure 6
Neutron transmission images of the welds positioned in `face-on' orientation relative to the incoming neutron beam. (a) Image integrated over the entire beam spectrum. (b) Only neutrons with wavelengths of 4.2–8 Å are used in this image. (c)–(g) Narrow-energy neutron transmission images of the welds positioned in `face-on' orientation. Image obtained at (c) 3.97 ± 0.1 Å, (d) 2.615 ± 0.015 Å, (e) 2.93 ± 0.03 Å, (f) 3.16 ± 0.01 Å, (g) 3.435 ± 0.035 Å. The defects seen in Al–steel weld images (a) and (b) are not due to variation in crystallographic structure of the weld as they are still present in the image taken at neutron energies where no diffraction is present. The texture in the copper weld area with striations perpendicular to the weld line is clearly visible owing to preferred orientation of filler material. Some texture in the melted steel of the Al–steel weld is also observed in image (c). The dashed rectangles indicate the areas for which resonance absorption spectra are shown in Fig. 13[link].

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 49| Part 4| August 2016| Pages 1130-1140
doi:10.1107/S1600576716006725
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