Gao Jie, Bao Liangman, Huang Hefei, Li Yan, Zeng Jianrong, Liu Zhe, Liu Renduo, Shi Liqun
Shanghai Institute of Applied Physics, Chinese Academy of Science (CAS), Shanghai 201800, China.
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
Materials (Basel). 2016 Oct 14;9(10):832. doi: 10.3390/ma9100832.
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.
这项工作报道了哈氏合金N在辐照后退火条件下氦泡的演变规律。在室温下进行氦离子辐照并随后在600℃（1小时）退火后，透射电子显微镜（TEM）显微照片显示在0至300nm深度范围内存在尺寸为2nm的氦泡。对于在850℃（5小时）进一步退火的样品，一方面，由于氦浓度降低，形成了一个氦泡稀少的“无泡区”（0至38nm）。另一方面，观察到了“粗化区”（38至108nm）和“合并区”（108至350nm），这两个区域中氦泡的尺寸和间距存在巨大差异，这是由不同的粗化速率导致的。这项工作通过实验证明的“奥斯特瓦尔德熟化”和“迁移与合并”机制可以解释这些观察结果。
