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首页> 外文期刊>Journal of the Mechanics and Physics of Solids >Softening-induced plastic flow instability and indentation size effect in metallic glass
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Softening-induced plastic flow instability and indentation size effect in metallic glass

机译：金属玻璃中软化引起的塑性流动不稳定性和压痕尺寸效应

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摘要

Despite the absence of microstructural features, metallic glasses (MGs) could display size-dependent hardness at the submicron scale. While most early studies attributed this size effect to Weibull statistics, here we propose a mechanism related to shear softening induced flow instability that can give rise to a deterministic indentation size effect in MGs. In line with this mechanism, an explicit relation is derived linking the size dependency of hardness to a critical length scale that governs the transition from a stable to unstable plastic flow in MGs. Through a series of carefully designed spherical indentation tests, this mechanism is experimentally justified, from which we are able to extract the critical transition length for a Zr-based MG at different indentation strain rates. On the basis of the combined theoretical/experimental efforts, our current work provides a quantitative insight into the indentation size effect in MGs.
机译：尽管没有微观结构特征，金属玻璃（MGs）仍可以显示亚微米级的尺寸依赖性硬度。尽管大多数早期研究将这种尺寸效应归因于威布尔统计，但在此我们提出了一种与剪切软化引起的流动不稳定性有关的机制，该机制可能导致MG中确定性的压痕尺寸效应。按照这种机制，可以得出明确的关系，将硬度的大小相关性与临界长度尺度相关联，该尺度决定了MG中从稳定塑性流动到不稳定塑性流动的过渡。通过一系列精心设计的球形压痕测试，该机理在实验上是合理的，从中我们可以提取出基于Zr的MG在不同压痕应变速率下的临界转变长度。在理论/实验相结合的基础上，我们目前的工作对MG的压痕尺寸效应提供了定量的见解。

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  • 作者

    S. Wang; Y.F. Ye; B.A. Sun; C.T. Liu; S.Q. Shi; Y. Yang;

  • 作者单位

    Centre for Advanced Structural Materials, Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon Tong, Kowloon, Hong Kong,Department of Mechanical Engineering, the Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;

    Centre for Advanced Structural Materials, Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon Tong, Kowloon, Hong Kong;

    Centre for Advanced Structural Materials, Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon Tong, Kowloon, Hong Kong;

    Centre for Advanced Structural Materials, Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon Tong, Kowloon, Hong Kong;

    Department of Mechanical Engineering, the Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;

    Centre for Advanced Structural Materials, Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon Tong, Kowloon, Hong Kong;

  • 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

    Metallic glasses; Strength scaling; Indentation; Shear instability;

    机译：金属玻璃;强度缩放;缩进;剪切不稳定;

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