氩离子辐照下纯镍薄膜的微观结构状态研究  

Microstructural characteristics of pure nickel foils under argon ion irradiation

作　　者：邹阳[1] 王晓彤[2] 吕鹏[2] 田娜娜 关庆丰[2] ZOU Yang;WANG Xiaotong;LYU Peng;TIAN Nana;GUAN Qingfeng(Jingjiang College,Jiangsu University,Zhenjiang 212013,China;College of Material Science and Engineering,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学京江学院,镇江212013 [2]江苏大学材料科学与工程学院,镇江212013

出　　处：《核技术》2021年第8期37-43,共7页Nuclear Techniques

摘　　要：为研究离子辐照对金属材料微观结构状态的影响,以透射电子显微镜为分析手段,探讨氩离子辐照对纯镍薄膜辐照缺陷及变形结构的影响规律。研究结果显示:氩离子辐照纯镍薄膜样品可诱发明显的辐照损伤效应;较低辐照剂量下,辐照缺陷团簇以黑点缺陷为主,其中包含大量的层错四面体;辐照剂量较高时,产生孔洞缺陷,其数密度随着辐照剂量而增大,其尺寸呈先上升后下降的趋势。与块体镍材料不同,较高剂量氩离子辐照可在纯镍薄膜中诱发位错扩展和孪生变形,其原因是:材料维度的降低可降低其对称性并抑制位错滑移系统的开动。[Background]Nickel-based superalloys are widely used in high temperature structural materials and have important applications in nuclear materials.Radiation damage characteristics are the key factors to evaluate the properties of nuclear materials.[Purpose]This study aims to investigate the effect of ion irradiation on the microstructure of metal materials.[Methods]The annealed pure nickel block was preliminarily cut into thin foils and pre-thinning.Then,the pit thinning,twin-jet electropolishing and other processes were applied to further thin the foil samples until they became electron-lucent.The pure nickel foils were irradiated by 120 keV argon ions(Ar+)with three different doses.The irradiation defects and deformed structures in the pure nickel foils were characterized by transmission electron microscope.[Results]The pure nickel foils have significant radiation damage after the Ar+irradiation.At the low Ar+irradiation dose,the irradiation defect clusters are dominated by black spot defects,which contained a large number of stacking fault tetrahedrons.The void defects occur at the relatively high Ar+irradiation dose.With the increase of Ar+radiation dose,the number density of void defects increases,while the size of void defects increases first and then decreases.[Conclusions]Unlike bulk pure nickel,the argon ion irradiation with relatively high dose is able to induce expansion dislocation and deformation twin in the pure nickel foils.This is because the decrease of material size can weaken its symmetry and inhibit the initiation of the dislocation slip system.

关 键 词：氩离子 纯镍薄膜 微观结构 缺陷团簇 变形孪晶 

分 类 号：O484[理学—固体物理] O485[理学—物理]