2014 Fiscal Year Final Research Report
Atomic scale observation of grain boundary segregation in nuclear materials by atom probe tomography and study on mechanism of grain boundary degradation
Project/Area Number |
24246155
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Research Category |
Grant-in-Aid for Scientific Research (A)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
Nuclear engineering
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Research Institution | Tohoku University |
Principal Investigator |
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Co-Investigator(Kenkyū-buntansha) |
INOUE Koji 東北大学, 金属材料研究所, 准教授 (50344718)
TOYAMA Takeshi 東北大学, 金属材料研究所, 講師 (50510129)
SHIMIZU Yasuo 東北大学, 金属材料研究所, 助教 (40581963)
NAGUMO Kazuaki 東北大学, 金属材料研究所, 助教 (40719259)
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Co-Investigator(Renkei-kenkyūsha) |
NISHIYAMA Yuataka 独立行政法人日本原子力研究開発機構, 安全研究センター, グループリーダー (60414596)
KATSUYAMA Jinya 独立行政法人日本原子力研究開発機構, 安全研究センター, 研究副主幹 (00403155)
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Project Period (FY) |
2012-04-01 – 2015-03-31
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Keywords | 粒界偏析 / 粒界脆化 / 3次元アトムプローブ / 原子炉高経年化 |
Outline of Final Research Achievements |
We have studied the microstructural changes of the structural materials of the nuclear reactors, which are very important for the integrity of the reactors, exposed by long-term neutron irradiation followed by the unexpected temperature rise above 450oC by using state-of-the-art nanoscale techniques, and have revealed the effects on the mechanical properties. The obtained results showed the different behavior in the irradiated materials from that in un-irradiated materials after the high temperature exposure. For example, the coarsening of irradiation induced Cu-rich precipitates in surveillance specimens of a rector pressure vessel are observed. The complementary theoretical calculation revealed the relationship between the microstructural changes and mechanical property changes.
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Free Research Field |
工学
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