Dynamical behavior of voids in neutron-irradiated copper at elevated temperature

概要

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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 the annealing experiments and in-situ observation in neutron-irradiated copper. Neutron irradiation was carried out in the temperature controlled capsule at KUR (Kyoto University Reactor). Neutron irradiation was performed at 300oC to damage level between 10-4 to 10-3 dpa. Annealing temperature was 250oC for 10, 20, 30 min sequentially for neutron- irradiated copper, after annealing TEM observation was carried out at room temperature. Experimental results show that void moved along [110] direction. Voids were moved during 250oC annealing but SFTs were not changed. We observed 37 voids and 8 voids were moved, the others vanished during annealing. The images of in-situ observation, void contrast images were recorded on VTR tape and analyzed by frame. At room temperature observation voids were static and white circle, however at 300oC in-situ observation contrast were changed like an oval and sometimes contrast was disappear. After 7 sec contrast was white circle and moved slightly and similar phenomena were observed quite frequently at 300oC. It is concluded that void moved with dynamical structural relaxation at elevated temperature.
Materials Research Societyの論文
2001-00-00