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

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
Materials 2016, 9(10), 832; https://doi.org/10.3390/ma9100832
Received: 26 September 2016 / Revised: 9 October 2016 / Accepted: 12 October 2016 / Published: 14 October 2016
(This article belongs to the Special Issue Modelling and Characterization of Defects in Metals)
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
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MDPI and ACS Style

Gao, J.; Bao, L.; Huang, H.; Li, Y.; Zeng, J.; Liu, Z.; Liu, R.; Shi, L. Evolution Law of Helium Bubbles in Hastelloy N Alloy on Post-Irradiation Annealing Conditions. Materials 2016, 9, 832.

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