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| Simulation Study on the Influence of Ni Interface Segregation on the Evolution of Cu-rich Solute Clusters in Reactor Pressure Vessel Materials |
| Received:July 02, 2021 Revised:July 08, 2021 |
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| DOI：10.7643/issn.1672-9242.2022.01.009 |
| KeyWord:reactor pressure vessel irradiation embrittlement solute cluster cluster composition profile interface segregation cluster dynamics method |
| Author | Institution |
| FENG Shuai-shuai |
Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Beijing , China |
| WAN Liu-ming |
Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Beijing , China |
| LYU Sha-sha |
Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing , China |
| CHEN Liang |
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai , China |
| LI Zheng-cao |
Institute of Technical Physics, Department of Engineering Physics, Tsinghua University, Beijing , China |
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| Abstract: |
| This paper aims to quantitatively study the contribution of the interface segregation of nickel atoms to the reduction of the surface energy between the clusters and the matrix, the promotion of cluster nucleation, and the increase of cluster number density, in order to deepen the understanding of the evolution of solute clusters in the reactor pressure vessel and the solute clusters mechanism in the irradiation embrittlement. By considering the interface segregation of nickel atoms in solute clusters of Fe-Cu-Ni ternary alloy, cluster dynamics method was used to study the influence of the distribution of nickel atoms in the clusters on the evolution of copper-rich solute clusters. Compared with copper clusters, the free energy of copper-nickel clusters after adding nickel atoms significantly reduced, and cluster number density significantly increased; as the interface segregation of nickel atoms in the clusters intensifies, the free energy of cluster and the cluster size gradually decreased, and cluster number density first rose slightly and then dropped. Nickel can promote the nucleation of copper-rich solute clusters and increase cluster number density. Among them, the interface segregation of nickel atoms may have limited contribution to promoting cluster nucleation; during the cluster growth process, the interface segregation of nickel atoms may be inhibit its growth and reduce the cluster size. |
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