Evolution Law of Helium Bubbles in Hastelloy N Alloy on Post-Irradiation Annealing ConditionsReportar como inadecuado


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


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1

Shanghai Institute of Applied Physics, Chinese Academy of Science CAS, Shanghai 201800, China

2

School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

3

Institute of Modern Physics, Fudan University, Shanghai 200433, China





*

Authors to whom correspondence should be addressed.



Academic Editor: Zengtao Chen

Abstract 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. View Full-Text

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





Autor: Jie Gao 1,2, Liangman Bao 1, Hefei Huang 1,* , Yan Li 1,* , Jianrong Zeng 1, Zhe Liu 1,2, Renduo Liu 1 and Liqun Shi 3

Fuente: http://mdpi.com/



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