About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Neutron and X-ray Scattering in Materials Science
|
| 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, |