(1. 兰州理工大学 材料科学与工程学院，兰州 730050；
2. 中国科学院 兰州化学物理研究所固体润滑国家重点实验室，兰州 730000)
摘 要: 利用直线等离子体模拟装置开展氮和氘等离子体注入钨的实验，采用微分干涉差显微镜(DIC)、场发射扫描电子显微镜(SEM)结合聚焦离子束(FIB)以及X射线光电子能谱仪，分别研究氮和氘等离子体辐照前后钨表面成分、形貌和微观组织结构的变化，采用超高真空热脱附系统对氮等离子体预先辐照后钨中氘的捕获状态和滞留总量进行分析。结果表明：经氮辐照后，钨样品表面形成了氮化钨相，进一步注入氘等离子体后其表面起泡增多，氘在钨中的滞留总量升高。这是由于氮化钨相的形成阻碍了氘原子沿表面方向扩散逃逸，使氘原子在钨的亚表面过饱和聚集，导致钨中氘致起泡现象更加明显。
关键字: 钨；氘；氮；氘滞留；等离子体辐照
（1. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China）
Abstract:The nitrogen and deuterium exposures were performed in the linear experimental plasma system (LEPS). The influences of nitrogen pre-irradiation on the composition, microstructure and morphology of deuterium-exposed tungsten were analyzed using differential interference contrast microscope, field emission scanning electron microscope combined focused ion beam system and X-ray photoelectron spectroscopy before and after nitrogen and deuterium plasma exposure. Deuterium desorption curve and total retention in tungsten were analyzed by thermal desorption spectroscopy. The results show that the bubbles of samples with nitrogen pre-irradiation were more obvious after deuterium irradiation compared to that of tungsten without nitrogen pre-irradiation. The formation of tungsten nitride layer near surface is found, which makes deuterium supersaturated on the tungsten sub-surface, then the increase of local stress leads to the increase of deuterium on the tungsten surface. The deuterium desorption curve and the total amount of deuterium in W samples further confirm that nitrogen pre-irradiation with a specific energy can increase deuterium retention in tungsten.
Key words: tungsten; deuterium; nitrogen; retention; plasma irradiation
