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Shear banding and fracture behaviors of a bulk metallic glass studied via in-situ bending experiments with notched and un-notched specimens

机译：通过原位弯曲实验用缺口和未缺口标本研究了散装金属玻璃的剪切带和断裂行为

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摘要

The shear banding and fracture behaviors of Ti_(32.8)Zr_(30.2)Ni_(5.3)Cu_9Be_(22.7) bulk metallic glass (BMG) were studied via in-situ three-point bending experiments using notched and un-notched specimens. A notch strengthening effect was found based on comparing the nominal flexural strength of the notched and un-notched specimens. From in-situ observations of the notched specimens, it was found that the first shear band initiated near the notch tip was followed by a spate of shear band initiations in a wider range of locations, leading to macroscopic yielding. The shear band zone continued to grow until the specimen fractured, with plastic strain being accommodated by repeated branching of shear bands and increase of shear offset in the earlier formed parts of shear bands. Significant differences in the 3-dimensional orientation and shear offset direction of shear bands were observed between the notched and un-notched specimens. These differences were analyzed by relating the elastic stress fields in the general direction of shear band growth, obtained by finite element modeling, to the ellipse criterion.
机译：通过原位三点弯曲实验研究了Ti_（32.8）Zr_（32.2）Zr_（5.2）Ni_（5.3）Zr_（5.3）Cu_9Be_（BMG）的剪切带和断裂行为。基于比较缺口和未缺口标本的标称弯曲强度，发现了一种凹口强化效果。从原位观察缺口样本，发现在凹口尖端附近启动的第一剪切带是在更广泛的位置中的剪切带引发的速度，导致宏观屈服。剪切带区继续生长，直到样品破裂，塑料应变通过反复分支容纳剪切带和剪切带的前方形成部分中的剪切偏移的增加。在缺口和未缺乏缺口标本之间观察到剪切带的三维取向和剪切偏移方向的显着差异。通过将通过有限元建模的剪切带生长的一般方向上的弹性应力场与椭圆标准相比，通过将弹性应力场联系起来分析这些差异。

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  • 来源
    《Materials Science and Engineering》 |2020年第4期|140005.1-140005.10|共10页
  • 作者

    Qiushi Li; Ruitao Qu; Zhefeng Zhang;

  • 作者单位

    Laboratory of Fatigue and Fracture for Materials Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 PR China G. W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta GA 30332-0405 USA;

    Laboratory of Fatigue and Fracture for Materials Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 PR China;

    Laboratory of Fatigue and Fracture for Materials Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 PR China Jihua Laboratory Foshan 528200 PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Amorphous materials; Electron microscopy; Stress/strain measurements; Plasticity; Fracture behavior;

    机译：非晶材料;电子显微镜;应力/应变测量;可塑性;骨折行为;

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