Interaction between hydrogen and defects in alloys studied by positrons produced by pair creation from LCS-gamma rays
| Project/Area Number |
26289365
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Nuclear engineering
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| Research Institution | Osaka Prefecture University |
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Principal Investigator |
Hori Fuminobu 大阪府立大学, 工学(系)研究科(研究院), 准教授 (20275291)
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| Co-Investigator(Kenkyū-buntansha) |
寺澤 倫孝 兵庫県立大学, 付置研究所, 研究員 (20197792)
井上 博之 大阪府立大学, 工学(系)研究科(研究院), 准教授 (40203252)
岩瀬 彰宏 大阪府立大学, 工学(系)研究科(研究院), 教授 (60343919)
宮本 修治 兵庫県立大学, 付置研究所, 教授 (90135757)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥16,120,000 (Direct Cost: ¥12,400,000、Indirect Cost: ¥3,720,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2014: ¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000)
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| Keywords | 格子欠陥 / 金属 / 陽電子消滅 / 水素 / 高速陽電子 / ビーム科学 / 陽電子ビーム / 対生成 / 腐食 / 脆性 |
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| Outline of Final Research Achievements |
A new positron production and measurement apparatus has been developed at a synchrotron radiation (SR) facility. Mega eV ordered positrons were created via pair creation in a Pb target by implantation of 16.7 MeV gamma-photons generated via inverse Compton scattering of visible laser beam from a 1 GeV electron beam circulating in the storage ring at the NewSUBARU-SR facility. Positrons, with an energy of 8 MeV, are directly implanted into a bulk sample to detect defects. By using this system, we have performed positron annihilation Doppler broadening measurement for bulk iron samples after corrosion test. In this experiment, we found that vacancy type defects were induced by hydrogen charging at a 4 mm depth from the surface by non-destruction measurement. Also, positron measurement results suggest that the different possibility of hydrogen trapping may occur at different type of vacancies in compound alloys.
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Report
(4 results)
Research Products
(68 results)
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[Presentation] Metastable state of small precipitates in Cu and Al alloys induced by energetic charged-particle irradiation and their effects on magnetic, electrical and mechanical properties2016
Author(s)
R. Mayumi, Y. Fujimura, S. Semboshi, F. Hori, T. Matsui, Y. Saitoh,, Y. Okamoto, K. Nishida , A. Iwase
Organizer
23rd International Symposium on Metastable, Amorphous and Nanostructured Materials
Place of Presentation
Nara
Year and Date
2016-07-04
Related Report
Int'l Joint Research
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