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On the intrinsic ductility of electrodeposited nanocrystalline metals

机译：关于电沉积纳米晶体金属的固有延展性

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摘要

While nanocrystalline materials hold promise for structural applications in which increased strength is beneficial, their adoption has been hindered by concerns over the achievable ductility, resulting largely from considerable data scatter in the literature. A statistically significant set of 147 electrodeposited nanocrystalline tensile specimens was used to investigate this topic, and it was found that while necking elongation obeys similar processing quality and geometrical dependencies as conventional engineering metals, the intrinsic ductility as measured by uniform plastic strain was unexpectedly independent of microstructure over the grain size range of 10–80 nm. This indicates that the underlying physical processes of grain boundary-mediated damage formation are strain-oriented phenomena that can be defined by a critical plastic strain regardless of the strength of the material as a whole.
机译：尽管纳米晶材料有望在强度提高的结构应用中发挥作用，但由于对可实现的延展性的担忧，阻碍了它们的采用，这主要是由于文献中的大量数据分散所致。具有统计意义的147个电沉积纳米晶拉伸样品组用于研究此主题，结果发现，尽管颈缩伸长率与常规工程金属具有相似的加工质量和几何依赖性，但通过均匀塑性应变测量的固有延展性出乎意料地独立于在10–80 nm的晶粒尺寸范围内的显微组织。这表明晶界介导的损伤形成的潜在物理过程是应变定向现象，无论材料整体强度如何，都可以通过临界塑性应变来定义。

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  • 来源
    《Journal of Materials Science》 |2011年第24期|p.7713-7724|共12页
  • 作者

    I. Brooks; G. Palumbo; G. D. Hibbard; Zhirui Wang; U. Erb;

  • 作者单位

    Department of Materials Science and Engineering, University of Toronto, Toronto, ON, M5S 3E4, Canada;

    Integran Technologies Inc., 5300 Northam Drive, Mississauga, ON, L4V 1H7, Canada;

    Department of Materials Science and Engineering, University of Toronto, Toronto, ON, M5S 3E4, Canada;

    Department of Materials Science and Engineering, University of Toronto, Toronto, ON, M5S 3E4, Canada;

    Department of Materials Science and Engineering, University of Toronto, Toronto, ON, M5S 3E4, Canada;

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