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The effect of pressure on hydrogen solubility in Zircaloy-4

DOI: 10.1016/j.jnucmat.2019.07.012 DOI Help

Authors: H. E. Weekes (Culham Science Centre) , D. Dye (Imperial College London) , J. E. Proctor (University of Salford) , D. Smith (University of Salford) , C. Simionescu (University of Salford) , T. J. Prior (University of Hull) , M. R. Wenman (Imperial College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Nuclear Materials

State: Published (Approved)
Published: July 2019
Diamond Proposal Number(s): 11823 , 11658

Abstract: 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.

Subject Areas: Materials

Instruments: I15-Extreme Conditions