The effect of High-Temperature Pre-Damage on Vacancy-Type defects and deuterium retention in tungsten

被引:0
|
作者
Zhu, Xiu-Li [1 ]
Ke, Zhen-Hua [1 ]
Cheng, Long [2 ]
Zhang, Peng [3 ]
Yuan, Yue [2 ]
Cao, Xing-Zhong [3 ]
Lu, Guang-Hong [2 ]
机构
[1] North China Elect Power Univ, Sch Nucl Sci & Engn, Beijing 102206, Peoples R China
[2] Beihang Univ, Sch Phys, Beijing 100191, Peoples R China
[3] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
基金
中国国家自然科学基金;
关键词
Tungsten; High-temperature ion irradiation; Vacancy-type defects; Plasma exposure; Deuterium retention; Surface blister; HIGH-FLUX; LOW-ENERGY; SURFACE-MORPHOLOGY; RADIATION-DAMAGE; HIGH FLUENCES; D PLASMA; EVOLUTION; BEHAVIOR; IRRADIATION; MECHANISMS;
D O I
10.1016/j.nme.2024.101620
中图分类号
TL [原子能技术]; O571 [原子核物理学];
学科分类号
0827 ; 082701 ;
摘要
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 predamage 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.
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页数:9
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