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首页> 外文期刊>Journal of Materials Research >Single versus successive pop-in modes in nanoindentation tests of single crystals
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Single versus successive pop-in modes in nanoindentation tests of single crystals

机译：单晶纳米压痕测试中的单弹出和连续弹出模式

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摘要

From recent nanoindentation experiments, two types of pop-in modes have been identified: a single pop-in with a large displacement excursion and a number of pop-ins with comparable and small displacement excursions. Theoretical analyses are developed here to study the roles played by indenter tip radius, pre-existing defect density, heterogeneous nucleation source type, and lattice resistance on the pop-in modes. The evolution of dislocation structures in earlier pop-ins provides input to modeling a stochastic, heterogeneous mechanism that may be responsible for the subsequent pop-ins. It is found that when the first pop-in occurs near theoretical shear stress, the pop-in mode is determined by the lattice resistance and tip radius. When the first pop-in occurs at low shear stress, whether the successive pop-in mode occurs depends on how the heterogeneous dislocation nucleation source density increases as compared to the increase of the total dislocation density. The above transitions are found to correlate well with the ratio of indenter tip radius to the mean spacing of dislocation nucleation sources.
机译：从最近的纳米压痕实验中，已经确定了两种类型的弹入模式：具有大位移偏移的单个弹入和具有可比位移偏移和小位移偏移的多个弹入。在这里进行理论分析，以研究压头尖端半径，预先存在的缺陷密度，异质成核源类型和弹出模式下的晶格电阻所起的作用。早期弹出窗口中位错结构的演变为建模可能导致后续弹出窗口的随机，异构机制提供了输入。可以发现，当第一次弹出发生在理论剪应力附近时，弹出模式由晶格电阻和尖端半径确定。当第一弹入发生在低剪切应力下时，是否出现连续弹入模式取决于与总位错密度的增加相比，异质位错成核源密度如何增加。发现上述过渡与压头尖端半径与位错成核源的平均间距之比很好地相关。

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  • 来源
    《Journal of Materials Research》 |2016年第14期|2065-2075|共11页
  • 作者

    Yuzhi Xia; Yanfei Gao; George M. Pharr; Hongbin Bei;

  • 作者单位

    Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, 3M Company, St. Paul, MN;

    Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831;

    Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831;

    Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831;

  • 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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