Suppressed grain growth and enhanced irradiation resistance of nano-grained waste form under electronic energy loss |
| |
| Affiliation: | 1. College of Physics, Sichuan University, Chengdu 610064, China;2. Key Laboratory of Radiation Physics and Technology of Ministry of Education, Sichuan University, Chengdu 610064, China;3. Institute for Advanced Study, Chengdu University, Chengdu 610106, China;4. Key Laboratory of High Energy Density Physics of Ministry of Education, Sichuan University, Chengdu 610064, China;1. Institute of Advanced Structure Technology, Beijing Institute of Technology, Haidian District, Beijing 100081, PR China;2. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China;3. Yangzhou Pinghang Power Technologies Ltd., Co., Yangzhou, Jiangsu, 225200, PR China;1. College of Physics, Sichuan University, Chengdu, 610064, China;2. Key Laboratory of Radiation Physics and Technology of Ministry of Education, Sichuan University, Chengdu, 610064, China;3. Key Laboratory of High Energy Density Physics of Ministry of Education, Sichuan University, Chengdu, 610064, China;4. Institute for Advanced Study, Chengdu University, Chengdu, 610106, China;1. Faculty of Materials Science, Lomonosov Moscow State University, Leninskie gory 1, Moscow 119991, Russia;2. Faculty of Сhemistry, Lomonosov Moscow State University, Leninskie gory 1, Moscow 119991, Russia;3. Emerging Technologies Research Center, XPANCEO, Dubai Investment Park 1, 607-0406 Dubai, United Arab Emirates;1. Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, China;2. School of Mechanical Engineering, Guilin University of Aerospace Technology, Guilin 541004, China;3. Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, Guilin University of Technology, Guilin 541004, China;1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;3. University of Chinese Academy of Sciences, Beijing 100049, China |
| |
| Abstract: | The effects of both nuclear energy loss and electronic energy loss need to be taken into consideration in the ceramic-based waste forms under repository environment. However, the irradiation responses of ceramic-based waste forms to each type of energy loss are somewhat different. In this study, the microstructure evolutions of ultrafine nano and micro Gd2Zr2O7-based waste forms were systematically studied under predominant electronic energy loss simulated by multi-energy He+ irradiation, and compared to those under predominant nuclear energy loss. The results reveal that the fewer He bubble chains, ribbon-like He bubbles and smaller microcracks were observed in the irradiated nano-grained sample. Additionally, nano-grained sample displayed a lower degree of amorphization and higher atomic order compared to micro-grained samples when subjected to predominant electronic energy loss. Moreover, the irradiation dominated by nuclear energy loss can easily induce the grain growth of nano-grained Gd2Zr2O7-based waste form, but in the present study this phenomenon was not observed under multi-energy He+ irradiation. Consequently, under predominant electronic energy loss, the thermodynamic instability and driving force for grain growth due to excess surface energy in the ultrafine nano sample can be suppressed. As a result, the sample demonstrated enhanced irradiation resistance due to the more efficient absorption and elimination of defects at grain boundaries induced by electronic excitation. We elucidated that enhanced irradiation resistance of the waste forms by tailoring the grain size requires the consideration of the effects of electronic energy loss and nuclear energy loss, which can provide guidance for the design and optimization of highly irradiation-resistant nuclear waste forms. |
| |
| Keywords: | Electronic energy loss Grain growth Irradiation resistance Nuclear energy loss Grain boundary |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
