(1. 蘭州理工大學 材料科學與工程學院，蘭州 730050；
2. 中國科學院 蘭州化學物理研究所固體潤滑國家重點實驗室，蘭州 730000)
摘 要: 利用直線等離子體模擬裝置開展氮和氘等離子體注入鎢的實驗，采用微分干涉差顯微鏡(DIC)、場發(fā)射掃描電子顯微鏡(SEM)結(jié)合聚焦離子束(FIB)以及X射線光電子能譜儀，分別研究氮和氘等離子體輻照前后鎢表面成分、形貌和微觀組織結(jié)構的變化，采用超高真空熱脫附系統(tǒng)對氮等離子體預先輻照后鎢中氘的捕獲狀態(tài)和滯留總量進行分析。結(jié)果表明：經(jīng)氮輻照后，鎢樣品表面形成了氮化鎢相，進一步注入氘等離子體后其表面起泡增多，氘在鎢中的滯留總量升高。這是由于氮化鎢相的形成阻礙了氘原子沿表面方向擴散逃逸，使氘原子在鎢的亞表面過飽和聚集，導致鎢中氘致起泡現(xiàn)象更加明顯。
關鍵字: 鎢；氘；氮；氘滯留；等離子體輻照
（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
