About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Accelerated Discovery and Qualification of Nuclear Materials for Energy Applications
|
Presentation Title |
Mesoscale Modeling of the Effect of Interfaces on Segregation of Point Defects and Solutes and the Patterning of Extended Defects |
Author(s) |
Karim Ahmed, Abdurrahman Ozturk, Merve Gencturk, Lin Shao |
On-Site Speaker (Planned) |
Karim Ahmed |
Abstract Scope |
We present a new approach for modeling the effect of interfaces on the segregation of point defects and solute atoms and the resultant pattering of voids and dislocations loops. The new approach couples the spatially-resolved rate-theory (SRRT) and phase-field (PF) modeling techniques. First the sink strength of discrete interfaces is calculated from the SRRT models as function of temperature, production bias, grain/particle size, and diffusivities. The values of the sink strengths are then used to derive the reaction rates between the individual interfaces and point defects in the PF models of microstructure evolution. Lastly, coupled PF and SRRT models are constructed to account for the concurrent microstructure evolution, solute segregation, and voids and loops pattering in Fe and Ni. The model predictions demonstrate the shortcoming of the classical homogenous rate-theory approach and the limitations of using ion irradiation to mimic neutron irradiation. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, Nuclear Materials, |