| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Advanced Characterization of Materials for Nuclear, Radiation, and Extreme Environments
|
| Presentation Title |
Uncovering the Effect of Grain Boundary Dopants on Irradiation Induced Grain Growth Through In Situ Microscopy |
| Author(s) |
Jason Trelewicz, William Streit Cunningham, Danny J. Edwards, Yuanyuan Zhu |
| On-Site Speaker (Planned) |
Jason Trelewicz |
| Abstract Scope |
Displacement damage under irradiation promotes microstructural coarsening in nanocrystalline metals containing a high interfacial area per unit volume. Targeted doping of grain boundaries has a profound impact on thermal stability, but insights on its role in radiation stability are needed to inform nanocrystalline alloy design models. Leveraging in situ electron microscopy to map dynamic events under ion irradiation, we explore the coupling between microstructural evolution and irradiation damage in a titanium doped nanocrystalline tungsten alloy. Relative to undoped tungsten, the alloy exhibits smaller defect loops and a delayed saturation dose with a period of irradiation induced grain growth during the transient damage accumulation and recovery stages. Application of a thermal spike grain growth model reveals that the nanostructure in the doped alloy plateaus to a much finer grain size relative to predictions for pure tungsten, indicating that doping for enhanced thermal stability also stabilizes the material against irradiation instabilities. |