310 ℃和350 ℃下锆-4合金中沉淀相非晶化研究
Amorphization of precipitates in Zr-4 alloy at 310 and 350℃
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摘要: 用大束流加速器和透射电子显微镜研究了Zr-4合金在310 ℃和350 ℃下的质子辐照效应。当质子能量为2 MeV，在310 ℃和350 ℃下质子辐照产生原子离位损伤达5 dpa（注量率为8.5×1013 cm-2·s-1），辐照前后的明场像、高分辨相和电子衍射花样均表明:在310 ℃辐照产生原子损伤达到5 dpa，沉淀相Zr(Cr,Fe)2边缘5～10 nm的区域已经非晶化，而在350 ℃时质子辐照却没有非晶化发生。沉淀相Zr(Cr,Fe)2的元素分布图像和浓度分布表明，铁元素向基体扩散并且聚集在非晶化边界区域。Abstract: Proton irradiation at temperatures of 310 and 350 ℃ has been researched using 2 MeV proton to a atom displacement damage level of 5 dpa at a dose rate of 8.5×1013 cm－２·s－１. Amorphization and Fe loss of Zr(Cr,Fe)2 and ZrFe2 precipitates are observed. No amorphization appears in ZrFe2 precipitates at 310 and 350 ℃. Proton irradiation at 350 ℃ does not lead to measurable amorphization or elemental redistribution. An amorphous rim is observed on the surface of Zr(Fe,Cr)2 precipitates, the thickness of which is 5～10 nm, in both a conventional and high-resolution TEM micrograph at 310 ℃. A bright rim is observed in the Fe map, less than 10 nm wide, indicating Fe segregation. Energy-filtered images indicate Fe accumulation in the matrix near the precipitate．
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Key words:
- zircaloy 4 /
- irradiation /
- amorphization /
- tem observation /
- elemental redistribution /
- atom dispacement damage
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