| Autor: |
Xiu-Li Zhu, Zhen-Hua Ke, Long Cheng, Peng Zhang, Yue Yuan, Xing-Zhong Cao, Guang-Hong Lu |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
Nuclear Materials and Energy, Vol 38, Iss , Pp 101620- (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2352-1791 |
| DOI: |
10.1016/j.nme.2024.101620 |
| Popis: |
This work investigated tungsten samples that were pre-damaged at room (300 K) and high temperatures (573 and 873 K) using 3.5 MeV iron ions and then exposed to the high-flux deuterium plasma. The vacancy-type defects and the behavior of deuterium retention in the investigated tungsten were characterized and compared to study the effect of high-temperature pre-damage. Results of slow positron annihilation with Doppler broadening spectroscopy indicate the introduction of numerous defects by the room-temperature damage and the formation of larger-sized vacancy clusters by the high-temperature pre-damage. Surface observation demonstrates that the pre-damage at room temperature effectively suppressed the formation of intra-granular blisters, while the pre-damage at high temperature did not exhibit such a significant suppression effect on blister formation. Thermal desorption results show that pre-damage at room temperature significantly increases deuterium desorption. Pre-damage at high temperatures also strengthens deuterium desorption, not as significantly as room-temperature pre-damage, and meanwhile produces additional desorption at around 900 K. These results indicate differences between room-temperature and high-temperature pre-damage in the generation of defects and their impact on deuterium retention. Compared to room-temperature pre-damage, high-temperature pre-damage tends to generate defects with a larger average size, weakening the suppression effect on deuterium aggregation and blistering within the grains of tungsten, reducing the quantity of deuterium trapping sites and producing higher-energy deuterium traps. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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