| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Special Topics in Nuclear Materials: Lessons Learned; Non-Energy Systems; and Coupled Extremes
|
| Presentation Title |
Effect of Applied Stress on Radiation-Induced Loop and Raft Formation in a BCC Metal |
| Author(s) |
Hi Vo, Wei-ying Chen, Matthew Schneider, Aaron Kohnert |
| On-Site Speaker (Planned) |
Hi Vo |
| Abstract Scope |
Several theories have been proposed regarding the impact of applied stress on the formation and evolution of radiation-induced microstructures in cascade-producing environments. Two competing mechanisms have been identified: stress-induced preferential absorption (SIPA) and stress-induced preferential nucleation (SIPN) of radiation-induced loops. The active mechanism in cascade-producing environments, like ion or neutron irradiation, remains uncertain. This study presents direct evidence through in situ transmission electron microscopy (TEM) observations confirming the stress-induced preferential nucleation mechanism in body-centered cubic (BCC) pure molybdenum for cascade-producing particles. In this study, under external stress, radiation-induced loops mainly agglomerate into rafts along the {111} plane experiencing the highest applied stress. Conversely, under stress-free conditions, the radiation-induced micro-structures exhibit a more random distribution, with rafts dispersed along multiple {111} planes. Furthermore, the average loop size is not affected by the external applied stress. These pieces of evidence show that SIPN is active during ion irradiation under applied stress. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Characterization, Mechanical Properties |