| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
|
| Presentation Title |
Multiscale Modeling of Radiation-induced Precipitation Hardening by Cu Nanoclusters in Fe-Cu Alloys |
| Author(s) |
Xian-Ming Bai |
| On-Site Speaker (Planned) |
Xian-Ming Bai |
| Abstract Scope |
Maintaining the long-term mechanical integrity of reactor pressure vessels (RPVs) is critical for the reactor safety of light water reactors. RPV steels typically contain low concentration of alloying elements such as Cu. Under neutron irradiation, many nano-size Cu clusters can precipitate as second phase particles. These Cu nanoclusters can block dislocation gliding and thus lead to precipitation hardening and embrittlement. In this work, cluster dynamics modeling is used to model the precipitation kinetics of Cu nanoclusters in Fe-Cu alloys of different compositions under neutron irradiation conditions. Molecular dynamics simulations are conducted to provide atomistic mechanisms of Cu precipitation process in the Fe matrix. Using the Cu precipitation kinetics from cluster dynamics modeling (e.g., Cu cluster number density and size), a barrier hardening model is used to predict Cu nanoclusters-induced precipitation hardening and embrittlement under different irradiation conditions. |