2007 Fiscal Year Final Research Report Summary
A Study on Void Nucleation Mechanisms with Realtime Detection of Nanovoids by Positron Beam
| Project/Area Number |
17560742
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear engineering
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| Research Institution | The University of Tokyo |
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Principal Investigator |
IWAI Takeo The University of Tokyo, Graduate School of Engineering, Assistant Professor (30272529)
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| Co-Investigator(Kenkyū-buntansha) |
ABE Hiroaki The University of Tokyo, Graduate School of Engineering, Associate Professor (40343925)
TSUCHIDA Hidetsugu Kyoto University, Graduate School of Engineering, Assistant Professor (50304150)
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| Project Period (FY) |
2005 – 2007
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| Keywords | void swelling / nanovoid / metal / positron annihilation spectroscopy / nickel |
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| Research Abstract |
Vacancy defects produced during ion irradiation were studied by using an irradiation system combined with a slow-positron apparatus and a high-energy ion accelerator. For two fcc metals of Ni and Al, in situ positron annihilation Doppler broadening measurements were performed during irradiation and non-irradiation. We found that an increase in the S parameter occurs during irradiation for Ni, but not for Al. The result for Ni strongly suggests that vacancy concentration during irradiation is high compared to that survived after irradiation, i. e., it includes transient or non-survivable vacancies. The formation of such a transient vacancy will be closely related to processes of defect accumulation or defect clustering. The present in situ observation technique is demonstrated to serve as a powerful tool for the investigation of vacancies produced in materials under an ion irradiation environment. The Doppler broadening line-shape of positron annihilation radiation is known to provide comparative information but less information about defect characteristics such as the density and the open volume size. In contrast, positron lifetime measurements allow obtaining quantitative information. We plan to do further experiments on in situ positron lifetime measurement during ion irradiation of materials in order to obtain more accurate insights into the dynamics of irradiation effects, in particular a quantitative understanding of vacancy characteristics induced transiently during irradiation.
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Research Products
(50 results)
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[Presentation] 陽電子消滅法その場計測によるイオン照射中に生じるtransientな空孔生成2005
Author(s)
土田秀次, 岩井岳夫, 粟野実佐, 片山一郎, 鄭淳讃, 小川英巳, 坂本直樹, 伊藤秋男, 秋吉優史, Qui Xu, 義家敏正
Organizer
京都大学原子炉実験所専門研究会「陽電子科学とその理工学への応用」
Place of Presentation
京都大学原子炉実験所
Year and Date
20051121-20051122
Description
「研究成果報告書概要(和文)」より
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