期刊
JOURNAL OF NUCLEAR MATERIALS
卷 477, 期 -, 页码 165-171出版社
ELSEVIER
DOI: 10.1016/j.jnucmat.2016.05.011
关键词
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资金
- National Magnetic Confinement Fusion Science Program of China [2013GB109004, 2014GB117000]
- Joint Sino-German research project [GZ 763]
- National Nature Science Foundation of China [51471092]
The orientation dependence of blister formation induced by D plasma exposure at low temperature (about 523 K) on rolled tungsten and chemical vapor deposition (CVD) W samples was studied by scanning electron microscopy and electron backscatter diffraction. Severe blistering was observed on grains with surface normal directions close to [111], while the [001] surfaces are the most resistant to blister formation. Cavities induced by D-2 gas were observed beneath [111], [110] and [001] surfaces, independently on whether blisters were observed on the surface or not. The [111] surface is more prone to blister formation, because it is easily plastically deformed by the D-2 gas pressure. Some blister edges and steps were perpendicular to [110] directions, which may be induced by the slipping of dislocations on {110} planes. The blister morphology induced by D plasma can be well explained by the blister model based on plastic deformation mechanism. (C) 2016 Elsevier B.V. All rights reserved.
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