| Project/Area Number |
11650683
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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 |
Physical properties of metals
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| Research Institution | Hiroshima University |
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Principal Investigator |
MUKOUDA Ichiro Faculty of Engineering, Hiroshima University, Research Associate, 工学部, 助手 (70209980)
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| Co-Investigator(Kenkyū-buntansha) |
SHIMOMURA Yoshiharu Faculty of Engineering, Hiroshima University, Professor, 工学部, 教授 (40033831)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2000: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1999: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | Radiation Damage / Void / Point defect clusters / Dislocation structure / Transmission electron microscopy / in-situ observation |
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| Research Abstract |
We reported previously an experimental result which shows that voids can move in neutron-irradiated copper at elevated temperature. To study the detailed behavior of voids, we carried out annealing experiments and in-situ observations in neutron-irradiated copper. Neutron irradiation was carried out in the temperature controlled capsule at KUR.(Kyoto University Reactor). Neutron irradiation was performed at 300℃ to damage levels between 10^<-4> to 10^<-3> dpa. The annealing temperature was 250℃ for 10, 20, 30 min sequentially for neutron- irradiated copper. After annealing TEM observation was carried out at room temperature. Experimental results show that voids moved along the [110] direction. Voids moved during 250℃ annealing but small stacking fault tetrahedra (SFT) were not changed. We observed 37 voids and 8 voids moved, the others vanished during annealing. The images of in-situ observation, void contrast images were recorded on VTR tape and analyzed frame by frame. At room temperature observation voids were static and were seen as white circles ; however at 300℃ the contrast changed to an oval shape and sometimes disappeared. After 7 sec contrast was a white circle and moved slightly and similar phenomena were observed quite frequently at 300℃. It is concluded that void moved with dynamical structural relaxation at elevated temperature.
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