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Mechanical properties of Cu nanowires: Effects of cross-sectional area and temperature

机译：Cu纳米线的力学性能：横截面积和温度的影响

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摘要

Nanostructured materials likely exhibit different mechanical properties from the corresponding bulk materials and have potential applications in a variety of areas. In this work, we use molecular dynamics simulation with embedded-atom potential to investigate the dependence of the mechanical properties of Cu nanowires of square cross-section, including Young's modulus, yield stress and surface force, on cross-sectional area and temperature for the Cu nanowires with cross-sectional areas in a range of 13.1 to 117.6 ran2 in a temperature range of 100 to 500 K. The simulation results reveal that the Young's modulus increases with the increase of the cross-sectional area at the same temperature and decreases with the increase of temperature for the same cross-sectional area. The yield stress decreases with the increase of the cross-sectional area at the same temperature in the range of 100 to 400 K and increases with the increase of the cross-sectional area at 500 K, while it decreases with the increase of temperature for the same cross-sectional area. The surface force decreases with the increase of the cross-sectional area at the same temperature and with the increase of temperature for the same cross-sectional area. Semi-empirical expressions relating the mechanical properties to temperature are proposed. Using the semi-empirical expressions, the Young's modulus at 0 K is found to decrease with the decrease of the cross-sectional area, and the yield stress at 0 K is found to decrease linearly with the increase of the cross-sectional area.
机译：纳米结构材料可能从相应的散装材料中表现出不同的机械性能，并在各种区域具有潜在的应用。在这项工作中，我们使用嵌入式原子电位的分子动力学模拟来研究方形横截面，包括杨氏模量，屈服应力和表面力的Cu纳米线的机械性能的依赖性，横截面积和温度Cu纳米线的横截面积为13.1至117.6 RAN2的温度范围为100至500k。模拟结果表明，杨氏模量随着相同温度的横截面积的增加而增加并减少相同横截面积的温度的增加。屈服应力随着100至400k的范围内相同温度的横截面积的增加而减小，并随着500 k的横截面积的增加而增加，同时随着温度的增加而降低相同的横截面积。随着相同温度的横截面积的增加，表面力随着相同的横截面积的温度的增加而降低。提出了将机械性能与温度相关的半实验表达式。使用半经验表达式，发现杨氏模量在0 k下，随着横截面积的降低而降低，并且发现0 k的屈服应力随着横截面积的增加而导线性地减小。

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  • 来源
    《Materials Science and Engineering》 |2020年第jul22期|139644.1-139644.9|共9页
  • 作者

    Hui Cao; Zhiyuan Rui; Fuqian Yang;

  • 作者单位

    School of Mechanical and Electronical Engineering Lanzhou University of Technology Lanzhou 730050 China Materials Program Department of Chemical and Materials Engineering University of Kentucky Lexington 40513 USA;

    School of Mechanical and Electronical Engineering Lanzhou University of Technology Lanzhou 730050 China;

    Materials Program Department of Chemical and Materials Engineering University of Kentucky Lexington 40513 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Molecular dynamics simulation; Cross-sectional area; Temperature; Mechanical properties; Cu nanowires;

    机译：分子动力学模拟;横截面面积;温度;机械性能;Cu纳米线;

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