| Project/Area Number |
25709003
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Partial Multi-year Fund |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Kansai University |
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Principal Investigator |
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| Research Collaborator |
TANAKA Nobuo 名古屋大学, 未来材料システム研究所, 教授 (40126876)
MUTO Shunsuke 名古屋大学, 未来材料システム研究所, 教授 (20209985)
KONDO Hikaru 関西大学, 大学院理工学研究科, 博士前期課程学生
AIHARA Kazuya 関西大学, 大学院理工学研究科, 博士前期課程学生
ASANO Ryo 関西大学, 大学院理工学研究科, 博士前期課程学生
ASHIDA Itaru 関西大学, 大学院理工学研究科, 博士前期課程学生
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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 |
¥24,700,000 (Direct Cost: ¥19,000,000、Indirect Cost: ¥5,700,000)
Fiscal Year 2015: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2014: ¥11,700,000 (Direct Cost: ¥9,000,000、Indirect Cost: ¥2,700,000)
Fiscal Year 2013: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
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| Keywords | 水素脆性 / 格子脆化説 / サブミクロン材料 / 電子顕微鏡 / 強度評価 / 機械材料・材料力学 / 水素 |
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| Outline of Final Research Achievements |
The hydrogen-enhanced decohesion (HEDE) theory, which is claimed to be one of the fundamental mechanisms of the so-called hydrogen embrittlement (HE), is experimentally investigated by utilizing the characteristic mechanical properties of submicron-scale materials (e.g. high yield strength, low dislocation density). Submicron specimens are fabricated from (i) a grain boundary (GB) in a polycrystal and (ii) a thin-film layered material. They are fractured either along the GB or interface in a transmission electron microscope (TEM) equipped with an environmental cell. Brittle GB fracture, which is also accompanied by plasticity, is observed only in a hydrogen environment. The strength against interfacial fracture is eminently reduced in a hydrogen environment. These results strongly suggest that the HEDE and its influence on fracture are present regardless of the material scale.
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