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RISS 인기검색어
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- 저자 : Liu Renduo (검색결과 2 건)
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Defects evolution and element segregation of Ni-Mo-Cr alloy irradiated by 30 keV Ar ions
Liu Min,Liu Wenguan,He Xiujie,Gao Yantao,Liu Renduo,Zhou Xingtai 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.8
In present study, TEM foils of Ni-Mo-Cr alloy were directly irradiated with 30 keV Ar ions to allow direct characterization. The defects evolution and element segregation after irradiation were investigated by TEM and HAADF-EDS linear scanning. At low irradiation doses (1.38 and 2.76 dpa), black dots were formed and grew with increasing dose. Complicated defects including peas-shaped dislocation loops, polygon dislocation networks and large loops were visible in samples irradiated to high doses (13.8 and 27.6 dpa). Meanwhile, dislocation channels appeared, in which defects were swept out. Significant Mo depletions at dislocation lines and grain boundaries were induced by irradiation due to large misfits between Mo-Ni atoms and high content of Mo.
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Ion Irradiation Enhanced Helium Atoms Re-Solution and the Related Hardening in Hastelloy N Alloy
Jizhao Liu,Hefei Huang,Renduo Liu,Jie Gao,Zhenbo Zhu,Yan Li 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.2
Transmission electron microscopy (TEM) and nanoindentation were performed in Hastelloy N alloy with three kinds ofirradiation mode: single He ions, He + Xe (3 dpa) ions and He + Xe (10 dpa) ions. TEM results showed the presence ofnano-sized irradiation-damage defects, such as helium bubbles, xenon bubbles, dislocation loops and precipitates. It wasfound that the helium bubble can grow up via absorbing vacancies, and the helium bubble shrinkage will be also occurreddue to the helium atoms re-solution. In the case of He + Xe (3 dpa) ions irradiation, the helium bubble growth via absorbingvacancies induced by subsequent Xe ion irradiation was more noticeable. As for the sample irradiated by He + Xe (10 dpa)ions, the ion irradiation enhanced helium atoms re-solution played an important role. Moreover, the helium atoms were moreeasily dissolved from small helium bubbles and the mechanisms behind them have also been shed light on. In addition, thedispersed barrier hardening and strengthening superposition models were used to predict the nanohardness increments producedby the different irradiation defects. The nanohardness increments measured by nanoindentation for irradiated sampleswere basically consistent with the calculated nanohardness increments.
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