2MeV质子辐照对Zr-4合金显微组织的影响

1. 电子科技大学应用物理系, 成都, 610054;
2. Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, Michigan 48109;
3. 北京大学电镜中心, 100000;
4. 北京科技大学材料物理系, 100000

基金项目:

国家自然科学基金(10175042)、海外杰出青年基金(19928510)和中国核动力研究设计院核燃料及材料国家重点实验室资助

Effect of 2MeV Proton Radiation on the Microstructure in Zircaloy 4

1. Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu, 610054, China;
2. Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, Michigan 48109;
3. Peking University, 100000, China;
4. Institute of Materials, University of Science & Technology Beijing, 100000, China

摘要: 通过密西根大学离子束表面改性和分析实验室的大束流加速器研究了Zr-4合金的质子辐照效应。结果表明:当原子离位损伤率约1×10^-5 dpa/s,在350癈质子辐照损伤分别达到2dpa、5dpa和7dpa时,辐照后位错环的密度分别为7×10²¹/m³、8×1021/m³、15×10²¹/m³,尺寸分别为7nm、11nm和11nm,表明位错环的密度和尺寸随质子辐照注量有增加的趋势。辐照前后的明场像、高分辨相和电子衍射花样均表明,在350℃ 2MeV的质子辐照没有使锆4合金中的hcp-Zr(Cr,Fe)₂和fcc-ZrFe₂沉淀相发生非晶化转变。
- Zr-4合金 /
- 质子辐照效应 /
- 位错环 /
- 透射电镜
Abstract: 2MeV proton radiation was performed at 350℃ at damage levels of 2, 5 and 7 displacement per atom. The resulted samples were investigated by the transmission electron microscopy. In the as-received samples, we observe precipitates of the commonly reported hexagonal close-packed Zr (Cr, Fe)₂, and a face-centered cubic alloy containing Zr and Fe, respectively. After radiation to 2dpa, 5dpa and 7dpa, dislocation loop are observed at a density of 7×10²¹ m^-3, 8×10²¹ m^-3 and 15×10²¹ m^-3, respectively. The corresponding loop size are 7nm、 11nm and 11nm, respectively. No amorphization happens for all precipitates.
- Zr-4 alloy /
- Proton radiation effects /
- Dislocation loops /
- Transmission electron microscope