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Size dependent mechanical properties of single crystalline nickel nanowires

机译：单晶镍纳米线的尺寸依赖性机械性能

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摘要

Using a simple micromechanical device, in situ tensile testing of single crystalline nickel (Ni) nanowires (NWs) with different diameters (100 to 300 nm) and crystalline orientations was performed inside a scanning electron microscope. With the aid of a quantitative nanoindenter and corresponding theoretical analysis, the load applied to the sample and the sample displacement were ascertained from nanoindenter load versus displacement curves so as to obtain engineering stress-strain curves. Limited plasticity and brittle-like fracture modes were evident in the Ni NWs investigated, and the breaking strength values were found to be much higher than that of the bulk material. More important, the critical resolved shear stress was found to increase as the NW diameter decreased, showing strong size dependence. The quantitative experimental results from this work could offer important insights into the origin of the size dependent mechanical behaviors of metals at the nano-scale.
机译：使用简单的微机械设备，在扫描电子显微镜内对具有不同直径（100至300 nm）和晶体取向的单晶镍（Ni）纳米线（NWs）进行原位拉伸测试。借助于定量的纳米压头和相应的理论分析，从纳米压头的载荷-位移曲线确定了施加到样品上的载荷和样品的位移，从而获得了工程应力-应变曲线。在研究的Ni NWs中，可塑性和脆性断裂模式明显受限，并且断裂强度值比散装材料高得多。更重要的是，发现随着NW直径的减小，临界解析剪切应力会增加，这显示出强烈的尺寸依赖性。这项工作的定量实验结果可以提供重要的见解，以了解纳米级金属的尺寸依赖性机械行为的起源。

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  • 来源
    《Journal of Applied Physics》 |2012年第6期|p.063524.1-063524.6|共6页
  • 作者

    Cheng Peng; Yogeeswaran Ganesan; Yang Lu; Jun Lou;

  • 作者单位

    Department of Mechanical Engineering and Materials Science, Rice University, Houston, Texas 77005, USA;

    Department of Mechanical Engineering and Materials Science, Rice University, Houston, Texas 77005, USA;

    Department of Mechanical Engineering and Materials Science, Rice University, Houston, Texas 77005, USA;

    Department of Mechanical Engineering and Materials Science, Rice University, Houston, Texas 77005, USA;

  • 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);
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  • 正文语种 eng
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