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Quantifying heterogeneous deformation in grain boundary regions on shock loaded tantalum using spherical and sharp tip nanoindentation

机译:使用球形和尖锐的纳米压痕量化在冲击加载钽上晶界区域的非均匀变形

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摘要

Grain boundaries play an important role in the overall mechanical performance of metals and alloys; however, isolating the effects of individual grain boundaries remains rather challenging experimentally. In this work, wire-feed, electron beam additively manufactured tantalum is studied under shock loading conditions generating incipient spall damage. Three grain boundaries aligned parallel to the shock direction were isolated inside a single sample. Postmortem metallography showed voids preferentially appeared on two of the three grain boundaries which had high misorientation angles > 30° compared to the third grain boundary with a relatively lower misorientation angle < 10°. Nanoindentation in grain boundary regions for both pyramidal and spherical tips showed characteristically different strain hardening trends for each grain boundary. Significant local strain hardening is present on both sides of one high angle grain boundary, while strain softening is captured at the other high angle grain boundary. A negligible trend of either hardening or softening is shown in the vicinity of the single low angle grain boundary. This leads to the conclusion that the trend of strain hardening/softening in grain boundary regions is not monotonically correlated to the susceptibility of specific grain boundaries to an increased propensity for void damage.
机译:晶界在金属和合金的整体机械性能中起着重要作用。然而,分离单个晶界的影响在实验上仍然具有挑战性。在这项工作中,在冲击载荷条件下产生初始剥落损坏的情况下,研究了送丝,电子束增材制造的钽。平行于冲击方向排列的三个晶界在单个样品中被隔离。事后金相分析显示,在三个晶界中的两个晶界中优先出现空洞,与第三个晶界相比,第三晶界具有较高的取向差角,取向角小于10°,而取向差角较小。锥体和球形尖端的晶界区域中的纳米压痕显示出每个晶界的特征不同的应变硬化趋势。在一个大角度晶粒边界的两侧都存在明显的局部应变硬化,而在另一个大角度晶粒边界处捕获了应变软化。在单个低角度晶粒边界附近显示出硬化或软化的可忽略的趋势。由此得出结论,晶界区域中应变硬化/软化的趋势与特定晶界对空位损坏倾向增加的敏感性没有单调相关。

著录项

  • 来源
    《Materials Science and Engineering》 |2018年第8期|373-382|共10页
  • 作者单位

    Center for Integrated Nanotechnologies, Materials Physics and Applications Division, Los Alamos National Laboratory;

    MST-8: Materials Science in Radiation and Dynamic Extreme, Los Alamos National Laboratory;

    Center for Integrated Nanotechnologies, Materials Physics and Applications Division, Los Alamos National Laboratory;

    Center for Integrated Nanotechnologies, Materials Physics and Applications Division, Los Alamos National Laboratory,Department of Chemical Engineering and Materials Science, University of Minnesota-Twin Cities;

    MST-8: Materials Science in Radiation and Dynamic Extreme, Los Alamos National Laboratory;

    MST-8: Materials Science in Radiation and Dynamic Extreme, Los Alamos National Laboratory;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Spall; Hardness; Dynamic deformation; Grains and interfaces; Stress/strain measurements; Electron microscopy;

    机译:剥落;硬度;动态变形;晶粒和界面;应力/应变测量;电子显微镜;

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