期刊
MATERIALS
卷 12, 期 16, 页码 -出版社
MDPI
DOI: 10.3390/ma12162628
关键词
radiation damage; sink efficiency; multilayer composite; interface; vacancy
类别
资金
- National Magnetic Confinement Fusion Energy Research Project from Ministry of Science and Technology of China [2015GB121004, 2017YFE0302500, 2018YFE0307100]
- National Natural Science and Foundation of China (NSFC) [11975034, 11921006, 11375018, 11528508]
- China-Romania Science and Technology Cooperation Committee 43rd Regular Meeting Exchange Program
- Ion Beam Materials Lab at Peking University
- Instrumental Analysis Fund of Peking University
- Program for New Century Excellent Talents in University
This paper provides a new method to compare and then reveal the vacancy sink efficiencies quantitively between different hetero-interfaces with a shared Cu layer in one sample, in contrast to previous studies, which have compared the vacancy sink efficiencies of interfaces in different samples. Cu-Nb-Cu-V nanoscale metallic multilayer composites (NMMCs) containing Cu/V and Cu/Nb interfaces periodically were prepared as research samples and bombarded with helium ions to create vacancies which were filled by helium bubbles. A special Cu layer shared by adjoining Cu/V and Cu/Nb interfaces exists, in which the implanted helium concentration reaches its maximum and remains nearly constant with a well-designed incident energy. The results show that bubble-denuded zones (BDZ) close to interfaces exist, and that the width of the BDZ close to the Cu/V interface is less than that of Cu/Nb interface. This result is explained by one-dimensional diffusion theory, and the ratio of vacancy sink efficiency between Cu/V and Cu/Nb interfaces is calculated. Conclusively, Cu/Nb interfaces are more efficient than Cu/V interfaces in eliminating vacancies induced by radiation.
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