|
| Dose-Rate Effect Simulation of Radiation Defect Characteristics in Fe-C Alloys |
| Received:June 08, 2021 Revised:July 05, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2022.01.008 |
| KeyWord:irradiation damage defects evolution Fe-C alloy dose-rate effect simulation |
| Author | Institution |
| LI Jian-yang |
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou , China;University of Chinese Academy of Sciences, Beijing , China |
| ZHANG Chong-hong |
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou , China |
| YANG Yi-tao |
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou , China |
|
| Hits: |
| Download times: |
| Abstract: |
| This paper attempts to explore the influence of dose rate on the microstructure characteristics of irradiation using computational simulation and to explore the mechanism of dose rate effect under normal temperature irradiation. Object Kinetic Monte Carlo (OKMC) method is used to study the variation characteristics of radiation defects with dose rate in the Fe-C system at room temperature. Simulation results show that the density of interstitial loops increased with the increasing dose rate at the lower dose range (<0.01 dpa), but high dose rate irradiation showed a lower interstitial-loops density, a larger average loop size at a higher dose range. By comparing the number of dislocation absorpted defects at different dose rates, it is concluded that the characteristics of dose rate in different dose ranges are attributed to the competition between dislocation absorption and defect recombination. Dislocation absorption play an important role in the low dose range. With the increase of dose rate, the number of defects absorbed in dislocation lines decreased significantly. However, at higher dose ranges, the recombination of interstitial-vacancy defects in the matrix probably increases significantly at the higher dose rate, so that high dose rate irradiation result in lower interstitial loop density and irradiation hardening. The work in this paper provides a scientific basis for understanding the mechanism of the dose rate effect and a scientific reference for ion beam simulation of neutron irradiation. |
| Close |
|
|
|