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首页> 外文期刊>Journal of engineering materials and technology >Molecular Dynamics Simulations of the Effect of Temperature and Strain Rate on the Plastic Deformation of Body-Centered Cubic Iron Nanowires
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Molecular Dynamics Simulations of the Effect of Temperature and Strain Rate on the Plastic Deformation of Body-Centered Cubic Iron Nanowires

机译：分子动力学模拟温度和应变率对体为立立方铁纳米线塑性变形的影响

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摘要

The tensile tests of body-centered cubic (BCC) Fe nanowires were simulated through molecular dynamics methods. The temperature and strain rate effects on the mechanical properties as well as the orientation-dependent plastic deformation mechanism were analyzed. For [001]-oriented BCC Fe nanowires, as the temperature increased, the yield stress and Young's modulus decreased. While the yield stress and Young's modulus increased as the strain rate increased. With the increase in temperature, when the temperature was less than 400 K, the twin propagation stress decreased dramatically, and then tended to reach a saturation value at higher temperatures. Under different temperatures and strain rates, the [001]-oriented Fe nanowires all deformed by twinning. The oscillation stage in the stress-strain curve corresponds to the process from the nucleation of the twin to the reorientation of the nanowire. For [110]-oriented Fe nanowires, the plastic deformation is dominated by dislocation slip. The independent events such as the nucleation, slip, and annihilation of dislocations are the causes of the unsteady fluctuations in the stress-strain curve. The Fe nanowires eventually undergo shear damage along the dominant slip surface.
机译：通过分子动力学方法模拟身体中心立方（BCC）Fe纳米线的拉伸试验。分析了对机械性能的温度和应变速率以及取向依赖性塑性变形机制的影响。对于[001] - 作为温度升高，因此屈服应力和杨氏模量减少了载体的BCC Fe纳米线。虽然随着应变速率的增加，屈服应力和杨氏模量增加。随着温度的增加，当温度小于400 k时，双繁殖应力显着降低，然后在较高温度下趋于达到饱和值。在不同的温度和应变速率下，通过孪生变形来在不同的温度和应变速率下。应力 - 应变曲线中的振荡阶段对应于从双胞胎到纳米线的重新定位的过程中的过程。对于[110] - 剂量的Fe纳米线，塑性变形是通过位错滑的主导。诸如脱位的成核，滑移和湮灭等独立事件是应力 - 应变曲线中不稳定波动的原因。 Fe纳米线最终沿主导滑动表面进行剪切损坏。

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  • 来源
    《Journal of engineering materials and technology》 |2021年第3期|031007.1-031007.8|共8页
  • 作者

    Qian Wu; Yong Wang; Tao Han; Hongtao Wang; Laihui Han; Liangliang Bao;

  • 作者单位

    School of Materials Science and Engineering China University of Petroleum No. 66 Changjiang West Road Huangdao District Qingdao 266580 China;

    School of Materials Science and Engineering China University of Petroleum No. 66 Changjiang West Road Huangdao District Qingdao 266580 China;

    School of Materials Science and Engineering China University of Petroleum No. 66 Changjiang West Road Huangdao District Qingdao 266580 China;

    School of Materials Science and Engineering China University of Petroleum No. 66 Changjiang West Road Huangdao District Qingdao 266580 China;

    School of Materials Science and Engineering China University of Petroleum No. 66 Changjiang West Road Huangdao District Qingdao 266580 China;

    School of Materials Science and Engineering China University of Petroleum No. 66 Changjiang West Road Huangdao District Qingdao 266580 China;

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

    molecular dynamics simulations; Fe nanowire; plastic deformation; temperature; strain rate;

    机译：分子动力学模拟;Fe纳米线;塑性变形;温度;应变率;

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