Improvement of Surface Exfoliation Behavior by Helium-ion Bombardment of a Tungsten Alloy Fabricated by Mechanical Alloying
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概要
- 論文の詳細を見る
Blistering and exfoliation of several tungsten alloys, which cause surface damage, were investigated using 3-MeV He-ion bombardment at room temperature (RT), 400, and 550°C. The alloy W-0.3TiC, which was fabricated by the mechanical alloying method and had an ultrafine grain structure, a K-doped W alloy, and pure W metal were examined to explore a way of suppressing the surface damage. In RT irradiation, surface exfoliation occurred at a fluence of (1–2)×1022 He/m2 in all the tested specimens. In the case of 550°C irradiation, surface exfoliation was observed above 2×1022 He/m2 irradiation in pure W and K-doped W, but no surface exfoliation was observed in W-0.3TiC up to a fluence of 2×1023 He/m2. The results showed that W-0.3TiC showed a higher resistance to surface exfoliation by He-ion bombardment and the level of resistance was temperature-dependent. The surface morphology, cross-sectional morphology, and microstructure were characterized by transmission electron microscopy. Helium thermal desorption spectrometry was carried out to determine the mechanism whereby the surface attained resistance to the damage through He-ion bombardment. The improvement in the resistance to the surface exfoliation could be attributed to the ultrafine grain structure and the intergranular enhanced He diffusion behavior of the MA-processed material.
- 社団法人 日本原子力学会の論文
- 2009-07-01
著者
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NOGAMI Shuhei
Department of Quantum Science and Energy Engineering, Tohoku University
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HASEGAWA Akira
Department of Quantum Science and Energy Engineering, Tohoku University
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KURISHITA Hiroaki
International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohok
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Ogawa Takayuki
Department of Cardiology, Jikei University
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Kurishita Hiroaki
International Research Center For Nuclear Material Science Institute For Material Research Tohoku Un
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Nogami Shuhei
Department Of Quantum Science And Energy Engineering Tohoku University
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Hasegawa Akira
Department Of Applied Bioorganic Chemistry Gifu University
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Nogami Shuhei
Department Of Quantum Science And Energy Engineering Graduate School Of Engineering Tohoku Universit
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Ogawa Takayuki
Department Of Quantum Science And Energy Engineering Tohoku University
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Ogawa Takayuki
Department Of Applied Chemistry And Bioengineering Graduate School Of Engineering Osaka City Univers
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Hasegawa Akira
Department Of Quantum Science And Energy Engineering Tohoku University
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Hasegawa Akira
Departmemt Of Information And Imaging Sciences Faculty Of Engineering Chiba University
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