About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Computational Materials Science and Engineering of Materials in Nuclear Reactors
|
Presentation Title |
Diffusion and Interaction of Prismatic Dislocation Loops in Stochastic Dislocation Dynamics |
Author(s) |
Yang Li, Max Boleininger, Christian Robertson, Laurent Dupuy, Sergei L Dudarev |
On-Site Speaker (Planned) |
Max Boleininger |
Abstract Scope |
BCC metals exposed to irradiation form mobile prismatic loops of <111> type, that in many cases represent the dominant type of radiation defects. As the microstructure of a fusion reactor component is expected to coarsen significantly over the service lifespan, a desired outcome of fusion materials research is predicting the fundamental laws of evolution governing this process.
The motion of <111> loops is driven by stochastic forces associated with thermal fluctuations. We find that the stochastic force in conjunction with internal degrees of freedom is a factor fundamentally affecting the dynamics of elastically interacting loops. The trapping reaction between loops depends critically on the internal re-orientation of their habit planes during the reaction, leading to increases in the lifetime of bound states by orders of magnitude. Inclusion of internal degrees of freedom makes the fundamental difference between loop rafts remaining bound and stable, or separating on experimentally relevant timescales. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |