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The mechanism of power-law scaling behavior by controlling shear bands in bulk metallic glass

机译:通过控制块状金属玻璃中的剪切带的幂律定标行为的机理

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摘要

Bulk metallic glasses deform irreversibly under a stress through shear-banding courses that manifest as the serrated flow behavior. The compressive deformation and dynamic serrated flow behavior of Zr_(52.5)Cu_(17.9)Ni_(14.6)Al_(10)Ti_5 bulk metallic glass samples with different aspect ratios have been investigated. The yield strength nearly remains a constant value of approximately 2 GPa, while the compressive plasticity increases obviously with decreasing aspect ratio. It is found that the serrated flows display a power-law scaling behavior at different aspect ratios. The power-law scaling behavior is discussed by controlling shear bands in BMG. In addition, a new method was proposed to study the power-law-scaling behavior. When the aspect ratio is small, the friction between the sample and the platen will play a significant role that attributes to a lateral constraint. The uniaxial stress and the lateral constraint will cause a hydrostatic pressure on the sample close to the platen. The shear bands are controlled by the different stress states, which leads to a power-law-scaling behavior in serrated flows. The investigations have a contribution to understanding the plastic-deformation mechanism of BMGs.
机译:大块金属玻璃在应力作用下会通过剪切带状过程不可逆地变形,这种剪切带状过程表现为锯齿状流动。研究了不同长宽比的Zr_(52.5)Cu_(17.9)Ni_(14.6)Al_(10)Ti_5大块金属玻璃样品的压缩变形和动态锯齿状流动行为。屈服强度几乎保持约2 GPa的恒定值,而压缩塑性随着纵横比的减小而明显增加。发现锯齿状流在不同的纵横比下显示出幂律缩放行为。通过控制BMG中的剪切带来讨论幂律缩放行为。此外,提出了一种研究幂律定标行为的新方法。当长宽比小时,样品和压板之间的摩擦将起重要作用,这归因于横向约束。单轴应力和横向约束将在靠近压板的样品上产生静水压力。剪切带由不同的应力状态控制,这导致锯齿状流中的幂律缩放行为。这些研究有助于理解BMG的塑性变形机制。

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  • 来源
    《Materials Science and Engineering》 |2015年第15期|663-670|共8页
  • 作者单位

    Laboratory of Applied Physics and Mechanics of Advanced Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;

    Laboratory of Applied Physics and Mechanics of Advanced Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China,Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China;

    Laboratory for Microstructures, Shanghai University, 200444 Shanghai, China;

    Deparement of Physics and Institute of Condensed Matter Theory, University of Illinois at Urbana Champaign, Urbana, IL 61801, USA;

    Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996-2200, USA;

    Institute of Applied Mechanics and Biomedical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;

    Laboratory of Applied Physics and Mechanics of Advanced Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;

    Laboratory of Applied Physics and Mechanics of Advanced Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China,Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China;

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

    Amorphous materials; Mechanical test; Deformation; Fracture;

    机译:非晶态材料;机械测试;形变;断裂;

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