| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Methods, Techniques, and Materials Discovery of Irradiation Effect Using In-situ Microscopy
|
| Presentation Title |
Transient Grating Spectroscopy of Defect Annealing Kinetics and Microstructural Evolution in Self-ion Implanted Tungsten with In-situ Annealing |
| Author(s) |
Mohamed Abdallah Reza, Kenichiro Mizohata, Cody Dennett, Guanze He, Hongbing Yu, Felix Hofmann |
| On-Site Speaker (Planned) |
Mohamed Abdallah Reza |
| Abstract Scope |
Using transient grating spectroscopy (TGS) with in-situ annealing, we study the evolution of crystal defects in self-ion implanted tungsten up to 800C for doses from 0.00032 to 3.2 dpa. A kinetic theory model interprets the underlying Frenkel pair concentrations from the measured TGS thermal diffusivities with high accuracy. Our results show a large removal of defects at ~350C, consistent with the temperatures for mono-vacancy mobility in tungsten. A near complete removal of defects was observed in the low dose samples (<0.0032 dpa) and ~70% for the larger doses. Ex-situ TEM confirmed the observation of remaining larger defects in the higher dose samples. These results present TGS as a tool for rapid quantification of irradiation-induced defects and their evolution in-situ, which is also sensitive to the smaller TEM invisible defects. The results also suggest that annealing at relatively modest temperatures may be used to significantly reduce irradiation-induced thermal diffusivity degradation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Characterization, High-Temperature Materials |