Blister bursting and deuterium bursting release from tungsten exposed to high fluences of high flux and low energy deuterium plasma
Blister bursting and deuterium bursting release from tungsten exposed to high fluences of high flux and low energy deuterium plasma
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DOI：
10.1088/0029-5515/47/3/006
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发表时间：
2007-03-01
期刊：
影响因子：
3.3
通讯作者：
Yamanishi, T.
中科院分区：
文献类型：
--
作者：
Shu, W. M.;Wakai, E.;Yamanishi, T.
用扫描电子显微镜、聚焦离子束和热脱附谱（TDS）研究了高注量（10（22）D+ m（-2）s（-1））和低能（38 eV）氘等离子体（高达1027 Dm（-2））辐照钨近表面区域的氘滞留和鼓泡现象。在520 K等离子体中，再结晶钨表面出现两种不同的气泡.一种是大小为几十微米且高度与宽度的比率不同（高达0.6）的大水泡，另一种是大小小于几微米且高度与直径的比率较大（约0.7）的小水泡。在等离子体暴露或TDS实验后，发现一些颗粒上出现了一种特殊的气泡破裂现象，其上有一个高高的、部分打开或完全打开的盖子。在700 K以下，当升温速率为0.5 K·s ~（-1）时，在TDS曲线上观察到氘的突释。提出了一种新的气泡破裂模型--“阶梯级联模型”。此外，还讨论了氘滞留和鼓泡现象的成因以及今后高Z材料的研究方向。
Deuterium retention and blistering in the near-surface region of tungsten exposed to high fluences (up to 1027 D m(-2)) of high flux (10(22) D+ m(-2) s(-1)) and low energy (38eV) deuterium plasma were examined with scanning electron microscopy, focused ion beam and thermal desorption spectroscopy (TDS). Two kinds of blisters appeared at the recrystallized tungsten exposed to the plasma at 520 K. One is the large blisters with sizes of a few tens of micrometres and varying ratios of height against width (up to 0.6), and the other is the small blisters with sizes of less than a few micrometres and a large ratio of height against diameter (about 0.7). A peculiar phenomenon of blister bursting with a tall, or partially opened or fully opened lid was found on some grains after plasma exposure or TDS experiment. In addition, bursting release of deuterium with sudden peaks was observed in the TDS curve below 700 K at a heating rate of 0.5 K s(-1). A new model named 'step-cascade model' was proposed to explain the blister bursting. Furthermore, the origin of deuterium retention and blistering as well as future work on high-Z materials were discussed.