About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Neutron and X-ray Scattering in Materials Science
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Presentation Title |
Quasi-elastic Neutron Scattering Measurements of Hydrogen Diffusion in Zirconium |
Author(s) |
Brent J. Heuser, Timothy Prisk, Jun-Li Lin, Tanya Dax, Yongfeng Zhang |
On-Site Speaker (Planned) |
Brent J. Heuser |
Abstract Scope |
The diffusivity of hydrogen in zirconium is an important property for nuclear reactor fuel cladding. The often used value dates to the 1970s and employed a variation of a diffusion couple technique. We have used QENS and the HFBS to directly measure the self-diffusion (in the absence of concentration gradients). We find significant departure from from this earlier work above 400C, with a reduction in activation energy from 0.46eV to 0.36eV. Density functional theory simulations implicate solute-impurity trapping as a possible explanation for the lower activation energy above 400C. Fixed window scans also allow us to directly measure the phase boundary upon heating and cooling. Discussion will focus on a comparison of our results and those of others in an attempt to reconcile conflicting diffusivity measurements in this system that data to the 1950s. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, |