Evolution of dislocation loops in austenitic stainless steels implanted with high concentration of hydrogen |
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| Authors: | Zhongcheng Zheng Ning Gao Rui Tang Yanxia Yu Weiping Zhang Zhenyu Shen |
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| Affiliation: | 1. Hubei Nuclear Solid Physics Key Laboratory, Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan, China;2. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China;3. Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu, China;4. Department of Physics, School of Science, Guangdong University of Petrochemical Technology, Maoming, China |
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| Abstract: | AbstractIt has been found that under certain conditions, hydrogen retention would be strongly enhanced in irradiated austenitic stainless steels. To investigate the effect of the retained hydrogen on the defect microstructure, AL-6XN stainless steel specimens were irradiated with low energy (100 keV) H2+ so that high concentration of hydrogen was injected into the specimens while considerable displacement damage dose (up to 7 dpa) was also achieved. Irradiation induced dislocation loops and voids were characterised by transmission electron microscopy. For specimens irradiated to 7 dpa at 290 °C, dislocation loops with high number density were found and the void swelling was observed. At 380 °C, most of dislocation loops were unfaulted and tangled at 7 dpa, and the void swellings were observed at 5 dpa and above. Combining the data from low dose in previous work to high dose, four stages of dislocation loops evolution with hydrogen retention were suggested. Finally, molecular dynamics simulation was made to elucidate the division of large dislocation loops under irradiation. |
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| Keywords: | Austenitic stainless steels ion irradiation dislocation loops hydrogen voids |
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