氦离子辐照下6061-Al合金中的氦泡行为研究  

Helium Bubble Behavior in 6061-Aluminum Alloys Under Helium Ion Irradiation

作　　者：闫占峰 郑健 周韦[1] 王浩 YAN Zhanfeng;ZHENG Jian;ZHOU Wei;WANG Hao(Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,Sichuan,China)

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《材料导报》2024年第1期136-142,共7页Materials Reports

基　　金：国防科工局核能开发项目。

摘　　要：通过室温下的He离子辐照来研究核级6061-Al合金中氦泡的演变行为,辐照剂量为2×10^(15)cm^(-2)、1×10^(16)cm^(-2)、1×10^(17)cm^(-2)和2×10^(17)cm^(-2),通过扫描电镜(SEM)和原子力显微镜(AFM)来表征分析辐照后铝合金表面的损伤情况,并通过透射电镜(TEM)表征辐照产生的氦泡等微观缺陷。结果表明,辐照后铝合金产生了表面损伤,表面起泡程度和粗糙度随着He辐照剂量的增加而明显增大。初步计算表明,入射的He大部分都用于形成表面起泡,只有少数分布在基体内形成均匀的氦泡。随着辐照剂量的增加,基体内氦泡的尺寸先保持不变,然后显著增加,而氦泡密度则先增加后降低。另外,还观察到氦泡在析出物和晶界上发生了偏向性聚集和长大。本工作对深入认识铝合金在研究堆内面临的宏观力学性能退化以及可能的辐照失效行为具有重要意义。In the work,the evolution behavior of helium bubbles in nuclear-grade 6061-Al alloy was studied by 190 keV He ion irradiation at room temperature with irradiation fluences of 2×10^(15) cm^(-2),1×10^(16) cm^(-2),1×10^(17)cm^(-2) and 2×10^(17)cm^(-2),respectively.The surface damage and he-lium bubbles induced by ion irradiation were characterized combining scanning electron microscopy(SEM),atomic force microscopy(AFM)and transmission electron microscopy(TEM).The surface blistering is found to increase obviously with the increasing fluences which contributes to the increasing roughness.Preliminary calculation shows that most of the incident He contribute to the surface blistering while only a small fraction are distributed in the material matrix to form uniform helium bubbles.With the increasing fluences,the He bubble size first remains stable which is independent of fluence,and then increases significantly at higher fluences.Compared with the bubble size change,the bubble density undergoes increase hereafter decrease.In addition,preferential aggregation and growth of helium bubbles on precipitates and grain boundaries which act as the favorable sites for bubble formation were observed.The study of the evolution behavior of helium bubbles is of great significance for fundamental research and understanding the degradation of macroscopic mechanical properties and possible irradiation failure behavior of aluminum alloy in the research reactor.

关 键 词：铝合金 氦泡 氦离子辐照 表面起泡 析出物 

分 类 号：TL341[核科学技术—核技术及应用]