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Understanding the release of helium atoms from nanochannel tungsten: a molecular dynamics simulation

机译：了解纳米通道钨中氦原子的释放：分子动力学模拟

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摘要

The design of highly radiation-tolerant plasma-facing materials (PFMs) is of great importance for fusion reactors. Our recent experiments have shown that nanochannel tungsten (W) films have clearly superior radiation tolerance properties. In the present work, helium clustering and release from nanochannel tungsten were studied by molecular dynamics simulations. The effects of temperature and vacancy concentration on the helium release from a tungsten cylinder were investigated. Our results show that nanochannel W that consists of thin W cylinders releases He atoms more quickly than bulk W with flat surfaces, thus greatly reducing the He concentration and suppressing the formation and growth of He bubbles, which leads to increased radiation tolerance. Moreover, the microstructural changes due to increasing He fluence are smaller in nanochannel W than those in bulk W. Although vacancies in nanochannel W will trap He atoms, the nanochannel W also has a stronger tendency to stabilize helium retention than bulk W. The mechanism of helium release from nanochannel W was also examined. The results reported here are beneficial for guiding future work in the design of radiation resistant PFMs.
机译：对于聚变反应堆而言，高度耐辐射的面向等离子体的材料（PFM）的设计非常重要。我们最近的实验表明，纳米通道钨（W）膜具有明显优越的辐射耐受性。在目前的工作中，通过分子动力学模拟研究了氦从纳米通道钨中的聚集和释放。研究了温度和空位浓度对钨钢瓶中氦气释放的影响。我们的结果表明，由薄W圆柱体组成的纳米通道W比具有平坦表面的整体W更快地释放He原子，从而大大降低了He的浓度并抑制了He气泡的形成和生长，从而提高了辐射耐受性。此外，由于纳米通道W中氦通量的增加而引起的微观结构变化要比整体W中的小。尽管纳米通道W中的空位会俘获He原子，但是纳米通道W也比整体W具有更强的稳定氦气滞留的趋势。还检查了从纳米通道W释放的氦气。此处报告的结果对于指导抗辐射PFM设计的未来工作很有帮助。

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  • 来源
    《Nuclear fusion》 |2019年第7期|076020.1-076020.11|共11页
  • 作者

    Wei Guo; Ren Feng; Fang Jingzhong; Hu Wangyu; Gao Fei; Qin Wenjing; Cheng Tao; Wang Yongqiang; Jiang Changzhong; Deng Huiqiu;

  • 作者单位

    Wuhan Univ, Ctr Ion Beam Applicat, Sch Phys & Technol, Hubei Nucl Solid Phys Key Lab, Wuhan 430072, Hubei, Peoples R China;

    Wuhan Univ, Ctr Ion Beam Applicat, Sch Phys & Technol, Hubei Nucl Solid Phys Key Lab, Wuhan 430072, Hubei, Peoples R China;

    Hunan Univ, Sch Phys & Elect, Dept Appl Phys, Changsha 410082, Hunan, Peoples R China;

    Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China;

    Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China|Univ Michigan, Dept Nucl Engn & Radiol Sci, Ann Arbor, MI 48109 USA;

    Wuhan Univ, Ctr Ion Beam Applicat, Sch Phys & Technol, Hubei Nucl Solid Phys Key Lab, Wuhan 430072, Hubei, Peoples R China;

    Wuhan Univ, Ctr Ion Beam Applicat, Sch Phys & Technol, Hubei Nucl Solid Phys Key Lab, Wuhan 430072, Hubei, Peoples R China;

    Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87545 USA;

    Wuhan Univ, Ctr Ion Beam Applicat, Sch Phys & Technol, Hubei Nucl Solid Phys Key Lab, Wuhan 430072, Hubei, Peoples R China;

    Hunan Univ, Sch Phys & Elect, Dept Appl Phys, Changsha 410082, Hunan, Peoples R China|Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    nanochannel tungsten; helium retention; helium cluster; molecular dynamics simulation;

    机译：纳米钨;氦保留;氦团簇;分子动力学模拟;

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