| About this Abstract |
| Meeting |
Materials in Nuclear Energy Systems (MiNES) 2021
|
| Symposium
|
Materials in Nuclear Energy Systems (MiNES) 2021
|
| Presentation Title |
Suppressing Irradiation Instabilities in Nanocrystalline Tungsten through Grain Boundary Doping |
| Author(s) |
Jason Trelewicz, W. Streit Cunningham, Khalid Hattar, Yuanyuan Zhu, Danny Edwards |
| On-Site Speaker (Planned) |
Jason Trelewicz |
| Abstract Scope |
Targeted doping of grain boundaries stabilizes nanostructured materials against thermal coarsening, which provides a pathway to advanced alloys containing a high density of defect sinks. However, the impact of dopants on irradiation damage processes in interfaces represents a knowledge gap in radiation-resistant alloy design. In this study, we probe the coupling between microstructural evolution and irradiation damage in nanocrystalline W-20 at.% Ti using complementary in situ and ex situ ion irradiation experiments. Compared with a nanocrystalline W film, the W-Ti alloy is shown to exhibit smaller defect loops and a delayed saturation dose with a period of irradiation induced grain growth during the transient damage accumulation regime. Application of a thermal spike grain growth model reveals that the microstructure in the W-Ti alloy plateaus to a much finer grain size relative to predictions for pure W, indicating that doping for enhanced thermal stability also stabilizes the material against irradiation-induced instabilities. |
| Proceedings Inclusion? |
Undecided |