The effect of pressure on hydrogen solubility in Zircaloy-4

Weekes, HE, Dye, D, Proctor, JE ORCID:, Smith, D, Simionescu, C, Prior, TJ and Wenman, M 2019, 'The effect of pressure on hydrogen solubility in Zircaloy-4' , Journal of Nuclear Materials, 524 , pp. 256-262.

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The effect of pressure on the room temperature solubility of hydrogen in Zircaloy-4 was examined using synchrotron X-ray diffraction on small ground flake samples in a diamond anvil cell at pressures up to 20.9 GPa. Different combinations of hydrogen level/state in the sample and of pressure transmitting medium were examined; in all three experiments, it could be concluded that pressure resulted in the dissolution of δ hydrides and that interstitial hydrogen seemingly retards the formation of ω Zr. A pressure of around 9 GPa was required to halve the hydride fraction. These results imply that the effect of pressure is thermodynamically analogous to that of increasing temperature, but that the effect is small. The results are consistent with the volume per Zr atom of the α, δ and ω phases, with the bulk moduli of α and δ, and with previous measurements of the hydrogen site molar volumes in the α and δ phases. The results are interpreted in terms of their implication for our understanding of the driving forces for hydride precipitation at crack tips, which are in a region of hydrostatic tensile stress on the order of 1.5 GPa.

Item Type: Article
Schools: Schools > School of Computing, Science and Engineering > Salford Innovation Research Centre
Journal or Publication Title: Journal of Nuclear Materials
Publisher: Elsevier
ISSN: 0022-3115
Related URLs:
Funders: Diamond Light Source, Engineering and Physical Sciences Research Council (EPSRC), EDF Energy
Depositing User: JE Proctor
Date Deposited: 08 Aug 2019 10:57
Last Modified: 16 Feb 2022 02:25

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