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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >Helium implantation effects on the tensile response of nano-twinned copper
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Helium implantation effects on the tensile response of nano-twinned copper

机译：氦注入对纳米铜铜的拉伸响应作用

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摘要

Metallic materials used in fission and fusion reactors will internally accumulate numerous lattice defects and bubbles because of high radiation. An in-depth understanding on the influence of bubbles is significant to the safety and life assessment of relevant engineering equipment. Here, molecular dynamics simulations are performed to investigate the effects of twin boundary (TB) spacing, inner-bubble pressure, temperature and bubble number density on uniaxial tensile deformation behaviors of helium bubbles implanted nano-twinned copper (nt-Cu). Simulation results reveal that the TB can significantly enhance the strength of nt-Cu because of the Hall-Petch effect. The increase of inner-bubble pressure reduces the critical stress of dislocation emission, which in turn reduces the yield stress. High temperature softens the models and increases the inner-bubble pressure. The weaken effect of pressure component is remarkable in the yield strength, while that has little impact on the elastic modulus and the average flow stress. In addition, the larger bubble number density is accompanied by the lower elastic modulus, yield stress and average flow stress. The present findings provide valuable suggestions for upgrading the design and fabrication of high radiation-resistant metallic materials. (C) 2020 Elsevier B.V. All rights reserved.
机译：由于高辐射，裂变和熔融反应器中使用的金属材料将在内部积累众多的晶格缺陷和气泡。对气泡影响的深入理解对于相关工程设备的安全和寿命评估是显着的。这里，进行分子动力学模拟，以研究双边界（Tb）间距，内气压，温度和气泡数密度对氦气血泡植入纳米孪晶铜（NT-Cu）的单轴拉伸变形行为的影响。仿真结果表明，由于霍尔 - 竖起效应，Tb可以显着提高NT-Cu的强度。内气泡压力的增加降低了位错发射的临界应力，这反过来减少了屈服应力。高温软化模型并增加内部气泡压力。压力分量的弱效应在屈服强度上显着，而对弹性模量具有很小影响和平均流应力。另外，较大的气泡数密度伴随着较低的弹性模量，屈服应力和平均流应力。本研究结果为提升高辐射金属材料的设计和制造提供了有价值的建议。 （c）2020 Elsevier B.v.保留所有权利。

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  • 来源
  • 作者

    Sun Jia; Li Qian; Tang Huayuan; Zhang Hongwu; Ye Hongfei; Zheng Yonggang;

  • 作者单位

    Dalian Univ Technol Fac Vehicle Engn &

    Mech Dept Engn Mech Int Res Ctr Computat Mech State Key Lab Struct An Dalian 116024 Peoples R China;

    Dalian Univ Technol Fac Vehicle Engn &

    Mech Dept Engn Mech Int Res Ctr Computat Mech State Key Lab Struct An Dalian 116024 Peoples R China;

    Dalian Univ Technol Fac Vehicle Engn &

    Mech Dept Engn Mech Int Res Ctr Computat Mech State Key Lab Struct An Dalian 116024 Peoples R China;

    Dalian Univ Technol Fac Vehicle Engn &

    Mech Dept Engn Mech Int Res Ctr Computat Mech State Key Lab Struct An Dalian 116024 Peoples R China;

    Dalian Univ Technol Fac Vehicle Engn &

    Mech Dept Engn Mech Int Res Ctr Computat Mech State Key Lab Struct An Dalian 116024 Peoples R China;

    Dalian Univ Technol Fac Vehicle Engn &

    Mech Dept Engn Mech Int Res Ctr Computat Mech State Key Lab Struct An Dalian 116024 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 原子能技术;
  • 关键词

    Nano-twinned copper; Helium bubble; Mechanical property; Molecular dynamics simulation; Uniaxial tension;

    机译：纳米孪晶;氦气泡;力学性质;分子动力学模拟;单轴紧张;

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