Irradiation damage of reduced activation ferritic/martensitic steel CLAM exposed to low-energy high-flux D + He mixture plasma
Irradiation damage of reduced activation ferritic/martensitic steel CLAM exposed to low-energy high-flux D + He mixture plasma
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DOI：
10.1016/j.fusengdes.2022.113015
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发表时间：
2022-03
影响因子：
1.7
通讯作者：
Yue Xu;Yunfeng Xu;Kai Yang;L. Luo;Shuyu Dai;H. Fu;Yucheng Wu
中科院分区：
文献类型：
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作者：
Yue Xu;Yunfeng Xu;Kai Yang;L. Luo;Shuyu Dai;H. Fu;Yucheng Wu
利用线性等离子体设备PSIEC，在样品温度为~ 800 K，离子通量为~ 4.0 × 1021m−2s−1，离子影响为~ 7.0 × 1024m−2，入射离子能量为~ 89 eV的条件下，广泛研究了还原活化铁素体/马氏体钢CLAM暴露于D + He混合等离子体中的辐照损伤行为。经辐照的CLAM钢表面形成纤维状纳米结构绒毛。在模糊结构内部和模糊结构下均观察到D和He气泡。随着混合等离子体中He浓度的增加，钢表面的损伤程度逐渐增大。毛丝的生长过程可以描述为针孔（起源于纳米气泡）到纳米球结构、波浪状侵蚀层、棒状结构，最终发展为纳米毛丝。等离子体暴露后，由于铁和铬的中z元素优先溅射，钨在近表面富集。测得的表面钨浓度根据等离子体中的He浓度变化在1.9 ~ 4.0 wt.%之间。溅射率随混合等离子体中He浓度的增加而增加。
Irradiation damage behavior of reduced activation ferritic/martensitic steel CLAM exposed to D + He mixture plasma was extensively investigated using the linear plasma facility PSIEC at a sample temperature of ∼800 K with an ion flux of ∼4.0 × 1021m−2s−1, an ion fluence of ∼7.0 × 1024m−2and an incident ion energy of ∼89 eV. Fiber-like nanostructure fuzz was formed on the irradiated CLAM steel surface. D and He bubbles were observed both inside and under the fuzz structure from cross-sectional TEM characterization. Damage level of the steel surface has been found to gradually increase as increasing He concentration in the mixed plasma. The growth process of fuzz can be described as pinholes (which originated from nano-bubbles) to nano-sphere structures, wavy erosion layers, rods, and eventually develops to nano-fuzz. Tungsten enrichment in the near-surface has been determined after plasma exposure due to preferential sputtering of middle-Z elements of iron and chromium. The measured surface tungsten concentration varied from 1.9 to 4.0 wt.%, depending on He concentration in the plasma. Obtained sputtering yield increased as well with increasing He concentration in the mixed plasma.