| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Methods, Techniques, and Materials Discovery of Irradiation Effect Using In-situ Microscopy
|
| Presentation Title |
Revealing Heat-treatment Induced Stoichiometric Variations in Neutron-irradiated
Yttrium Hydrides Using In Situ Synchrotron Radiation Diffraction |
| Author(s) |
Mahmut Nedim Cinbiz, Mehmet Topsakal, Annabelle Le Coq, Kory Linton |
| On-Site Speaker (Planned) |
Mahmut Nedim Cinbiz |
| Abstract Scope |
Neutron-irradiated and fresh yttrium hydride specimens were characterized in situ using high-energy synchrotron x-ray diffraction experiments while the samples were subjected to heat treatments. The evolution of the yttrium hydride and minor yttrium phases were monitored as a function of temperature and time. The high-energy synchrotron x-rays enabled to determine hydrogen redistribution in the samples during the heat treatments. While heating, the initial yttrium phase completely dissolved above 400˚C in all samples. During the cooling stage of the fresh sample, the initial yttrium phase re-appeared around 200˚C, but its intensity was lower than its initial intensity. For irradiated samples, yttrium phase unexpectedly diminished during the cooling stage, which revealed a positive shift on the hydrogen atomic fraction after heat treatments while expecting vice versa. This indicated that yttrium hydride superior phase stability. Observations were speculated by the release of trapped hydrogen from pre-existing and irradiation-induced defects |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, High-Temperature Materials, Other |