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| Nucleation and Growth of Irradiation-Induced Ni-Si Clusters in Fe-Ni-Si Ternary Alloy |
| Received:June 25, 2021 Revised:July 20, 2021 |
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| DOI：10.7643/issn.1672-9242.2022.01.004 |
| KeyWord:irradiation clusters atom probe tomography nano-indentation Fe-Ni-Si |
| Author | Institution |
| CHEN Han |
Department of Materials Science and Engineering/Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing , China |
| HU Rong |
Department of Materials Science and Engineering/Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing , China |
| JIN Shen-bao |
Department of Materials Science and Engineering/Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing , China |
| XUE Fei |
Suzhou Nuclear Power Research Institute, Suzhou , China |
| SHA Gang |
Department of Materials Science and Engineering/Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing , China |
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| Abstract: |
| In order to investigate the effects of interaction between Ni and Si on formation and evolution of clusters in RPV alloy, ion-irradiated experiments were carried out on Fe Ni Si ternary model alloy of PRV steel. The clusters were analyzed by using atom probe tomography (APT) and the hardness was analyzed by nano-indentation technology. The nano-indentation results indicated that the hardness of the samples increased with increasing in the irradiation dose. The atom probe results indicated that irradiation introduced formation of Ni-Si solute clusters in the alloy. The number density and volume fraction of the solute clusters increased with increasing dose. The Si/Ni ratio of the clusters are different under different irradiation doses. With the increase of cluster size, the Si/Ni ratio shows an upward trend. In conclusion, at the low dose, the Ni-Si clusters are in their early stage formation with a high Ni concentration; at the high dose, the growth of Ni-Si clusters is predominant, and mainly via large clusters merging with small clusters. Furthermore, the mass fraction of Si in clusters increases with the increase of cluster size. |
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