| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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TEM Characterization of Helium Bubbles in T91 and MNHS Steels Implanted with 200 keV He Ions at Different Temperatures |
| WANG Ji1,2,3, GAO Xing1, WANG Zhi-Guang1**, WEI Kong-Fang1, YAO Cun-Feng1, CUI Ming-Huan1, SUN Jian-Rong1, LI Bing-Sheng1, PANG Li-Long1, ZHU Ya-Bin1, LUO Peng1, CHANG Hai-Long1, ZHANG Hong-Peng1, ZHU Hui-Ping1,2, WANG Dong1,2, DU Yang-Yang1,2, XIE Er-Qing3 |
1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000
2University of Chinese Academy of Sciences, Beijing 100049
3School of Physical Science and Technology, Lanzhou University, Lanzhou 730000
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| Cite this article: |
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WANG Ji, GAO Xing, WANG Zhi-Guang et al 2015 Chin. Phys. Lett. 32 076101 |
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Abstract Modified novel high silicon steel (MNHS, a newly developed reduced-activation martensitic alloy) and commercial alloy T91 are implanted with 200 keV He2+ ions to a dose of 5×1020 ions/m2 at 300, 450 and 550°C. Transmission electron microscopy (TEM) is used to characterize the size and morphology of He bubbles. With the increase of the implantation temperature, TEM observations indicate that bubbles increase in size and the proportion of 'brick shaped' cuboid bubbles increases while the proportion of polyhedral bubbles decreases in both the steel samples. For the samples implanted at the same temperature, the average size of He bubbles in MNHS is smaller than that in T91. This might be due to the abundance of boundaries and precipitates in MNHS, which provide additional sites for the trapping of He atoms, thus reduce the susceptibility of MNHS to He embrittlement.
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Received: 30 September 2014
Published: 30 July 2015
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| PACS: |
61.72.Ff
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(Direct observation of dislocations and other defects (etch pits, decoration, electron microscopy, x-ray topography, etc.))
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61.72.J-
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(Point defects and defect clusters)
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61.72.sh
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(Impurity distribution)
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