| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Characterization of Nuclear Materials and Fuels with Advanced X-ray and Neutron Techniques
|
| Presentation Title |
In-situ Investigation into The Stability of Hydride Phases in Zirconium |
| Author(s) |
Fei Long, Nima N. Badr, Matthew Topping, Igor Cherubin, Jun-Sang Park, Mark R. Daymond |
| On-Site Speaker (Planned) |
Fei Long |
| Abstract Scope |
High energy synchrotron x-ray diffraction in-situ heating/cooling has been used to study the dissolution/precipitation behavior of hydrides in Zr and its alloy systems. The stability of hydride phases, in particular the commonly observed delta and gamma hydrides, were studied by thermal cycling under a slow temperature ramp, in pure Zr, Zircaloy-2, and Zr-2.5Nb alloy. It is found that gamma phase is the low temperature stable phase in the binary Zr-H system, with delta phase precipitating first as the high temperature phase. In Zr alloys, however, the stability of delta extends down to room temperature; if there is any transformation to gamma it appears very sluggish. In-situ hydrogen ingress tests were conducted for a Zr-2.5Nb sample with hydride layer on two lateral surfaces, through which the memory effect of hydride precipitation is addressed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Phase Transformations, Characterization |