| Project/Area Number |
25420750
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Ibaraki University |
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Principal Investigator |
Itoh Goroh 茨城大学, 工学部, 教授 (80158758)
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| Co-Investigator(Kenkyū-buntansha) |
ITOH NOBUHIDE 茨城大学, 工学部, 教授 (70203156)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | 表面酸化皮膜 / 水素 / アルミニウム合金 / 塑性変形 / 粒界 / すべり線 / 段差 / 無析出帯 / 酸化皮膜 / 金属材料 / 水素脆化 / 水素挙動 / 第2相 / 金属間化合物 |
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| Outline of Final Research Achievements |
In ferritic steels, it was found that the surface oxide film is not a crucial barrier for hydrogen emission. In an Al-9%Mg alloy, hydrogen emission was observed in some of the grain boundaries as well as slip bands when specimen was deformed in tension. At the grain boundaries where hydrogen was emitted, it was presumed that the hydrogen was transported with slipping in a neighboring grain, with a formation of the surface step causing the fracture of the surface oxide film, and then emitted. In an Al-Zn-Mg alloy, similar result was obtained but the deformation was localized near the grain boundaries because of the presence of the precipitate free zones, and hence hydrogen was emitted at grain boundaries with more variety. Therefore, it was concluded that the surface oxide film plays an important role in hydrogen intrusion and emission.
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