| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Radiation Effects in Metals and Ceramics
|
| Presentation Title |
Nanoscale Characterisation of Re/Os Precipitation and Mechanical Degradation In Neutron Irradiated Tungsten |
| Author(s) |
Matthew LLoyd, Duc Nguyen, Michael Moody, Paul Bagot, Robert Abernethy, David Armstrong |
| On-Site Speaker (Planned) |
David Armstrong |
| Abstract Scope |
In this research, neutron irradiated single and polycrystalline, pure-W was irradiated to 1.67dpa at 1174K, producing a post irradiation composition of W-1.4at.%Re-0.1at.%Os. Characterisation of this material was carried out using Atom Probe Tomography (APT) and Scanning Tunnelling Electron Microscopy (STEM). The change in brittle to ductile transition was measured using 4 point bending and hardening using nanoindentation
Precipitates, mostly comprised on Re but with an Os rich central region were identified using APT. The presence of voids associated with these precipitates was indicated by regions of higher atomic density in the reconstruction of the APT data. High Angle Annular Dark Field (HAADF) imaging and STEM EDX of the samples identified voids decorated with both Re and Os, as well as smaller precipitates without visible voids. The brittle to ductile transition temperature is seen to increase by 600K. The mechanisms for this will be discussed through an energetics based model. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |