Xu Hang, Si Shuyao, Li Yipeng, Liu Xiangbing, Li Wenqing, Jiang Changzhong, Zhao Shijun, Wang Hui, Xiao Xiangheng
Department of Physics and Hubei Nuclear Solid Physics Key Laboratory, Wuhan University, Wuhan 430072, China.
Institute of Science and Technology of The 404 Company Limited, China National Nuclear Corporation, Jiayuguan 735100, China.
Fundam Res. 2022 Feb 15;2(3):437-446. doi: 10.1016/j.fmre.2022.01.028. eCollection 2022 May.
As a promising candidate material for the accident tolerant fuel cladding in light water reactors, the Nb-containing FeCrAl alloy has shown outstanding out-of-pile service performance due to the Laves phase precipitation. In this work, the radiation response in FeCrAl alloys with gradient Nb content under heavy ion radiation has been investigated. The focus is on the effect of the Laves phase on irradiation-induced defects and hardening. We found that the phase boundary between the matrix and Laves phase can play a critical role in capturing radiation defects, as verified by heavy-ion radiation experiments and molecular dynamic simulations. Additionally, the evolution of Laves phase under radiation is analyzed. Radiation-induced amorphization and segregations observed at high radiation doses will deepen the fundamental understanding of the stability of Laves phases in the radiation environment.
作为轻水反应堆中事故容错燃料包壳的一种有前景的候选材料，含铌FeCrAl合金由于Laves相析出而表现出优异的堆外服役性能。在这项工作中，研究了重离子辐照下具有梯度铌含量的FeCrAl合金的辐照响应。重点是Laves相对辐照诱导缺陷和硬化的影响。我们发现，基体与Laves相之间的相界在捕获辐照缺陷方面可发挥关键作用，这已通过重离子辐照实验和分子动力学模拟得到验证。此外，还分析了辐照下Laves相的演变。在高辐照剂量下观察到的辐照诱导非晶化和偏析将加深对Laves相在辐照环境中稳定性的基本理解。
