About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials Systems for the Future of Fusion Energy
|
Presentation Title |
Reduced Interstitial Mobility in W Based Transition Metal Ternary Systems |
Author(s) |
Younggak Shin, Byeongchan Lee, Keonwook Kang |
On-Site Speaker (Planned) |
Younggak Shin |
Abstract Scope |
Under neutron irradiation, at the presence of collision cascades, the mobility of point defects is a key property that governs the formation of volumetric defects such as interstitial clusters and voids. The mobility can be reduced by alloying due to the interaction between solutes and point defects.
This study presents defect energetics and dynamics in W-Ta-Re systems, especially focused on the mobility of interstitial in such systems. The result shows that a Ta, a Re, and a W self-interstitial atom prefer to form a stable triple complex with strong attractive interaction. The interaction energy of the triple complex, which is higher than the corresponding one in W-Re binary systems, works as a primary dissociation barrier that reduces the interstitial mobility. Ta also restricts well-known 3D non-dissociative migration of W-Re mixed dumbbell and slows the migration further. Therefore, the multicomponent alloying may change the irradiated-damage mechanism in fusion environment. |
Proceedings Inclusion? |
Planned: |
Keywords |
Other, Other, Other |