Subsurface morphology changes due to deuterium bombardment of tungsten
Subsurface morphology changes due to deuterium bombardment of tungsten
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DOI：
10.1088/0031-8949/2009/t138/014040
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发表时间：
2009-12
期刊：
影响因子：
2.9
通讯作者：
S. Lindig;M. Balden;V. Alimov;T. Yamanishi;W. Shu;J. Roth
中科院分区：
文献类型：
--
作者：
S. Lindig;M. Balden;V. Alimov;T. Yamanishi;W. Shu;J. Roth
将再结晶的多晶钨暴露于高通量（1022 D m−2 s−1）和低能量（38 eV D−1）的氘等离子体束中，其通量高达1027 D m−2。样品温度在320 - 800 K之间变化。通过扫描电子显微镜结合聚焦离子束截面和电子背散射衍射研究了泡状结构的三维形貌和晶粒取向。在表面下观察到具有扭曲区域（480 K）的裂纹。根据低指数滑移系{110}，表面气泡状结构和下面的缺陷沿着沿着W晶粒的晶体取向相关。缺陷是移动的，并且在氘负载下积累。暴露在室温附近的样品在随后加热到1300 K时不会形成如此大的空腔。高于700 K的氘轰击不会导致气泡状结构。
Recrystallized polycrystalline tungsten was exposed to a deuterium plasma beam with high flux (1022 D m−2 s−1) and low energy (38 eV D−1) to fluences up to 1027 D m−2. The sample temperature was varied between 320 and 800 K. The three-dimensional morphology of blister-like structures and the grain orientation were investigated by scanning electron microscopy combined with focused ion beam cross-sectioning and electron backscattering diffraction. Cracks with distorted areas (480 K) were observed beneath the surface. The surface blister-like structures and the defects underneath are correlated along crystallographic orientation of the W grains in accordance to the low-indexed slip system {110}⟨111⟩. The defects are mobile and accumulate under deuterium loading. Samples exposed near room temperature do not form such large cavities by subsequent heating up to 1300 K. Deuterium bombardment above 700 K does not lead to blister-like structures.