Microscopic evolution of pre-damaged and undamaged tungsten exposed to low-energy and high-flux helium ions
Microscopic evolution of pre-damaged and undamaged tungsten exposed to low-energy and high-flux helium ions
复制标题
暴露于低能量和高通量氦离子中的预损坏和未损坏钨的微观演化
DOI：
10.1016/j.nimb.2014.02.011
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发表时间：
2014-04-15
影响因子：
1.3
通讯作者：
Wang, Younian
中科院分区：
文献类型：
--
作者：
Yang, Qi;Liu, Dongping;Wang, Younian
高能（260 keV）He+预损伤和未损伤的多晶钨样品在873 K的样品温度下用低能量（220 eV）和高通量（类似于10（21）ions/m（2）s）He+以1.0 x 10（25）ions/m（2）的通量辐照。这些样品的微观演变进行了非破坏性的导电原子力显微镜和纳米硬度测试。分析表明，辐照钨样品中大量的纳米突起是由于纳米氦泡内压过高所致。由于氦原子在钨材料中的自捕获和自组织作用，可以形成具有相同直径和平均间距的有序和纳米结构的氦泡。在预损伤的情况下，低能He+辐照导致纳米结构氦泡的随机分布，表明高能He+注入导致钨材料严重的辐照损伤，充当氦泡的核。(C)2014爱思唯尔有限公司版权所有。
High-energy (260 keV) He+ pre-damaged and undamaged polycrystalline tungsten samples were irradiated with low-energy (220 eV) and high-flux (similar to 10(21) ions/m(2) s) He+ at a sample temperature of 873 K to a fluence of 1.0 x 10(25) ions/m(2). Microscopic evolution of these samples was carried out using non-destructive conductive atomic force microscopy and a nanohardness test. Analysis indicates that a large number of nanometer-sized protuberances of irradiated tungsten samples results from over-high internal pressure of nanometer-sized helium bubbles. Ordered and nanostructured helium bubbles with the same diameter and average spacing can be formed due to the self-trapping and self-organizing of helium atoms in the tungsten materials. In the case of pre-damaged, low-energy He+ irradiation results in a random distribution of nanostructured helium bubbles, indicating that high-energy He+ implantation results in serious irradiation damage of tungsten materials, acting as nuclei for helium bubbles. (C) 2014 Elsevier B.V. All rights reserved.