Evolution Law of Helium Bubbles in Hastelloy N Alloy on Post-Irradiation Annealing Conditions

Materials

卷:9

Liqun Shi¹  Jie Gao²  Renduo Liu²  Hefei Huang²  Liangman Bao²  Zhe Liu²  Jianrong Zeng²  Yan Li² 

[1] Institute of Modern Physics, Fudan University, Shanghai 200433, China;

[2] Shanghai Institute of Applied Physics, Chinese Academy of Science (CAS), Shanghai 201800, China;

关键词: nuclear materials;    radiation damage;    helium bubble;    denuded zone;    Ostwald ripening;    migration and coalescence;   

DOI  :  10.3390/ma9100832

来源: DOAJ

【 摘 要 】

This work reports on the evolution law of helium bubbles in Hastelloy N alloy on post-irradiation annealing conditions. After helium ion irradiation at room temperature and subsequent annealing at 600 °C (1 h), the transmission electron microscopy (TEM) micrograph indicates the presence of helium bubbles with size of 2 nm in the depth range of 0–300 nm. As for the sample further annealed at 850 °C (5 h), on one hand, a “Denuded Zone” (0–38 nm) with rare helium bubbles forms due to the decreased helium concentration. On the other hand, the “Ripening Zone” (38–108 nm) and “Coalescence Zone” (108–350 nm) with huge differences in size and separation of helium bubbles, caused by different coarsening rates, are observed. The mechanisms of “Ostwald ripening” and “migration and coalescence”, experimentally proved in this work, may explain these observations.

【 授权许可】

Unknown