2MeV质子辐照对Zr-4合金显微组织的影响

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

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癈 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。

MeV proton radiation was performed at 350癈 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, disloca-tion loop are observed at a density of 7?021 m-3, 8?021 m-3 and 15?021 m-3, respectively. The corresponding loop size are 7nm、11nm and 11nm, respectively. No amorphization happens for all precipitates.