| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Radiation Effects in Metals and Ceramics
|
| Presentation Title |
Coupled Irradiation Induced Grain Growth and Damage Evolution in Solute Stabilized Nanocrystalline Tungsten |
| Author(s) |
Streit Cunningham, Khalid Hattar, Jason Trelewicz |
| On-Site Speaker (Planned) |
Streit Cunningham |
| Abstract Scope |
The unique thermodynamic state occupied by nanocrystalline alloys presents opportunities for designing materials against instabilities while simultaneously enhancing their radiation tolerance through the deliberate introduction of defect sinks. In this study, we probe the coupling between microstructural evolution and irradiation damage state in nanocrystalline W-20 at.% Ti using ion irradiation experiments. Defect evolution is mapped up to 20 dpa through in situ measurements and bridged to high-dose stability using ex situ experiments up to 400 dpa. The nanostructure is shown to exhibit a transient peak damage state followed by a reduction in defect density, which is attributed to the interaction of defect loops with migrating grain boundaries during irradiation induced grain growth. Grain size stabilizes around 50 nm, still well within the nanocrystalline regime, and is shown to be accompanied by a saturation of the loop density that continues out to the maximum dose of 400 dpa. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |