Isotope effects in thermal neutron transmission and backscattering processes for ε-phase zirconium hydrides and deuterides

The visualization of hydrogen distribution in materials is important to understand hydrogen embrittlement behavior. Neutron imaging experiment was carried out in order to visualize the distribution of solute hydrogen in an Al 10.1 Zn 1.2 Mg alloy and a pure palladium after hydrogen charging. Changes in the contrast of neutron transmission images caused by hydrogen were clearly observed in a palladium. In the wavelength range of 2 3 Å and 5 13.5 Å, the mean neutron transmission around the center of a hydrogen charged palladium were 0.692 and 0.511, respectively. The hydrogen content in a palladium was estimated to be 10.8 mol from the measured neutron transmission. In this study, it has been demonstrated that hydrogen content can be analyzed even in non monochromatic neutron imaging by considering the wavelength dependence of neutron intensity, and the effects of incoherent scattering and of Bragg edge on transmission. On the other hand, hydrogen could not be observed from the neutron transmission image in Al Zn Mg alloys. This was due to the low hydrogen content, which was mass ppm level even after hydrogen charging, and statistical precision was not suf cient to discuss the amount of hydrogen of the mass ppm order.

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Isotope effects in thermal neutron transmission and backscattering processes for ε-phase zirconium hydrides and deuterides

Cited by 2 publications

References 18 publications

Imaging of an operating LaNi4.8Al0.2–based hydrogen storage container

Imaging of an operating LaNi4.8Al0.2–based hydrogen storage container

Neutron Imaging Analysis of Hydrogen Content in Pure Palladium and Aluminum Alloys

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