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High temperature indentation creep mechanisms of metal-ceramic nanolaminates

机译：金属陶瓷纳米胺的高温缩进蠕变机制

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摘要

Creep, as one of the mechanical properties for evaluating the resistance of deformation under a persistent stress, is extremely important in the application of metal/ceramic nanolaminates. In this work, the creep behaviors of Al/SiC nanolaminates with layer thickness of 10 run and 100 nm were studied by means of nanoindentation in the temperature range from 25 °C to 150 °C. It was found that the stress exponent of nanolaminates for layer thickness of 100 nm increased with an increase in temperature. The stress exponent of Al was obtained by inverse methodology based on the finite element simulations, indicating that the creep mechanism changed from dislocation-grain boundary interaction to Coble creep. In the contrary, nanolaminates with layer thickness of 10 nm exhibited temperature-independent creep behaviors. This was rationalized by the co-deformation of Al and SiC layers beneath the indenter, which was dominated in the whole temperature range. In addition, all of these conclusions were further confirmed by the detailed transmission electron microscopic observation, the activation energy and the activation volume analysis.
机译：蠕变，作为评估持续应力下变形电阻的机械性能之一，在施加金属/陶瓷纳米胺时非常重要。在这项工作中，通过在25℃至150℃的温度范围内，通过纳米凸缘研究了10次运行的Al / SiC纳米胺的蠕变行为和100nm。发现，随着温度的增加，100nm的层厚度为100nm的纳米胺的应力指数增加。基于有限元模拟，通过逆方法获得Al的应力指数，表明蠕变机制从位错 - 晶界相互作用变为蠕变。相反，具有10nm的层厚度为10nm的纳米胺表现出温度无关的蠕变行为。这是通过在压模下方的Al和SiC层的共变化来合理化，其在整个温度范围内占主导地位。此外，通过详细的透射电子显微镜观察，活化能量和活化体积分析进一步证实了所有这些结论。

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  • 来源
    《Materials Science and Engineering》 |2021年第20期|140450.1-140450.10|共10页
  • 作者

    Yunsheng Chen; Jun Wang; Yajie Feng; Gang Zhao; Xigao Jian; Lingwei Yang; Jian Xu;

  • 作者单位

    Engineering Laboratory of Advanced Energy Materials Ningbo Institute of Material Technology & Engineering CAS Ningbo 315201 China University of Chinese Academy of Sciences Beijing 100049 China;

    Engineering Laboratory of Advanced Energy Materials Ningbo Institute of Material Technology & Engineering CAS Ningbo 315201 China University of Chinese Academy of Sciences Beijing 100049 China;

    Engineering Laboratory of Advanced Energy Materials Ningbo Institute of Material Technology & Engineering CAS Ningbo 315201 China;

    Engineering Laboratory of Advanced Energy Materials Ningbo Institute of Material Technology & Engineering CAS Ningbo 315201 China State Key Laboratory of Fine Chemicals Liaoning High Performance Polymer Engineering Research Center School of Chemical Engineering Dalian University of Technology Dalian 116024 China;

    State Key Laboratory of Fine Chemicals Liaoning High Performance Polymer Engineering Research Center School of Chemical Engineering Dalian University of Technology Dalian 116024 China;

    Engineering Laboratory of Advanced Energy Materials Ningbo Institute of Material Technology & Engineering CAS Ningbo 315201 China Hypervelocity Aerodynamics Institute China Aerodynamics Research and Development Center Mianyang 621000 China;

    Engineering Laboratory of Advanced Energy Materials Ningbo Institute of Material Technology & Engineering CAS Ningbo 315201 China State Key Laboratory of Fine Chemicals Liaoning High Performance Polymer Engineering Research Center School of Chemical Engineering Dalian University of Technology Dalian 116024 China;

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  • 正文语种 eng
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  • 关键词

    Nanolaminates; Creep; Nanoindentation; High temperature deformation; Finite element model;

    机译：纳米胺;蠕动;纳米intentation;高温变形;有限元模型;

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