Study of dynamical behavior of point defect clusters in neutron-irradiated metals at elevated temperature by electron microscopy

电子显微镜研究高温中子辐照金属中点缺陷簇的动力学行为

• 批准号: 11650683
• 负责人: MUKOUDA Ichiro
• 金额: $ 1.79万
• 依托单位: Hiroshima University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650683/
• 关键词: Radiation Damage; Void; Point defect clusters; Dislocation structure; Transmission electron microscopy; in-situ observation

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.

我们以前报道的实验结果表明，空洞可以在中子辐照铜在高温下移动。为了研究空洞的详细行为，我们在中子辐照的铜中进行了退火实验和原位观察。在KUR的温控舱中进行了中子辐照。（京都大学反应堆）。在300℃下进行中子辐照，损伤水平在10 <-4>~ 10 μ <-3>dpa之间。中子辐照铜的退火温度为250℃，退火时间依次为10、20、30 min.退火后，在室温下进行TEM观察。实验结果表明，空洞沿着[110]方向移动。在250℃退火过程中，空洞发生了移动，但小的层错四面体（SFT）没有发生变化。在退火过程中观察到37个空洞，其中8个空洞移动，其余空洞消失。将原位观察图像、空隙对比图像记录在VTR磁带上，逐帧分析。在室温下观察时，空隙是静态的，并被视为白色圆圈;然而，在300℃下，对比度变为椭圆形，有时消失。7秒后，对比度为白色圆圈，并轻微移动，在300℃下经常观察到类似现象。结果表明，在高温下，空穴随动态结构弛豫而移动。

项目成果

Y.Shimomura,: "Point Defects Observed in D-T neutron irradiated Copper, Silver and Gold at 288K with a Rotating Target in FNS JAERI"Mat.Res.Soc.Sump.Proc.. (in press). (2001)

Y.Shimomura，：“在 FNS JAERI 中使用旋转靶在 288K 下 D-T 中子辐照铜、银和金中观察到的点缺陷”Mat.Res.Soc.Sump.Proc.（正在出版）。

Y.Shimomura.: "Point Defects Observed in D-T neutron irradiated Copper, Silver and Gold at 288K with a Rotating Target in FNS JAERI"Mat.Res.Soc.Symp.Proc.. (in press). (2001)

Y.Shimomura.：“在 FNS JAERI 中使用旋转靶在 288K 下 D-T 中子辐照铜、银和金中观察到的点缺陷”Mat.Res.Soc.Symp.Proc.（正在出版）。

I.Mukouda: "Dynamical Behavior of Voids in Neutron-irradiated Copper"Mat.Res.Soc.Symp.Proc.. (in press). (2001)

I.Mukouda：“中子辐照铜中空洞的动态行为”Mat.Res.Soc.Symp.Proc..（印刷中）。

I.Mukouda: "Microstructure in pure copper irradiated by simultaneous multi-ion beam of hydrogen, helium and selfions"J.Nucl.Mater.. 283-287. 302-305 (2000)

I.Mukouda：“氢、氦和自离子多离子束同时辐照纯铜的微观结构”J.Nucl.Mater. 283-287。

I.Mukouda: "Formation of voids in pure copper and Fe-Cr-Ni alloys irradiated by simultaneous multi-ion beam of hydrogen, helium and Ni ions"Mat.Res.Soc.Symp.Proc.. 540. 549-554 (1999)

I.Mukouda：“氢、氦和 Ni 离子同时多离子束辐照纯铜和 Fe-Cr-Ni 合金中空隙的形成”Mat.Res.Soc.Symp.Proc.. 540. 549-554 (