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Characterization and investigation of size effect in nano-impact indentations performed using cube-corner indenter tip

机译：使用立方角压头对纳米压痕进行尺寸表征和研究

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摘要

The traditional macro-scale form of dynamic indentation measures the dynamic deformation behavior of a material by simulating impact conditions. Similarly, the nano-impact indentation technique, with small-scale contacts and high spatial resolutions, is a novel technique for obtaining mechanical properties of materials at dynamic strain rates (>10~2 s~(-1)). Nano-impact hardness values display a decreasing trend or size effect that continues for several micrometers of indentation depth, compared to the primarily sub micrometer depth range of size effect in quasi-static nanoindentations. For the first time, the factors behind the enhanced size effects for dynamic micro-scale indentations have been investigated by the current work: non-uniform loading and resulting instability using strain rate profiles, plastic wave behavior during loading using resistance force versus indentation depth profiles, quantification of energy of the dynamic plastic wave, and localization of impact strain using electron backscattered diffraction (EBSD) mapping of the strain affected vicinity of indentation imprints.
机译：传统的动态压痕的宏观形式通过模拟冲击条件来测量材料的动态变形行为。类似地，具有小尺寸接触和高空间分辨率的纳米冲击压痕技术是一种在动态应变率（> 10〜2 s〜（-1））下获得材料机械性能的新技术。与准静态纳米压痕的尺寸效应的主要亚微米深度范围相比，纳米压痕硬度值显示出减小的趋势或尺寸效应，该趋势或压痕效应在压痕深度的几微米处持续。当前工作首次研究了动态微米级压痕尺寸效应增强的背后因素：不均匀加载和使用应变率曲线导致的不稳定性，加载过程中使用阻力与压痕深度曲线的塑性波行为，动态塑性波能量的量化以及使用应变影响的压痕印记附近区域的电子背散射衍射（EBSD）映射来确定冲击应变的位置。

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  • 来源
    《Journal of Materials Research》 |2017年第12期|2241-2248|共8页
  • 作者

    Abhi Ghosh; Sumin Jin; Javier Arreguin-Zavala; Mathieu Brochu;

  • 作者单位

    Department of Mining and Materials Engineering, McGill University, Montreal H3A 0C5, Quebec, Canada;

    Department of Mining and Materials Engineering, McGill University, Montreal H3A 0C5, Quebec, Canada;

    Department of Mining and Materials Engineering, McGill University, Montreal H3A 0C5, Quebec, Canada;

    Department of Mining and Materials Engineering, McGill University, Montreal H3A 0C5, Quebec, Canada;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
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