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Dual specimen-size dependences of plastic deformation behavior of a traditional Zr-based bulk metallic glass in compression

机译：传统Zr基大块金属玻璃在压缩状态下塑性变形行为的双标本尺寸依赖性

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摘要

The plastic deformation behavior of a traditional BMG with the composition of Zr_(65)Cu_(17.5)Ni_(10)Al_(7.5) was investigated in compression using the precursory-specimens with different casting sizes and hence different initial states. With increasing the mechanical-testing size of specimen, it is demonstrated that more pronounced action of elastic recoveries of testing machine and specimen led to a decrease in plasticity because of larger shear-strain was introduced in shear bands. Furthermore, for the specimens with the same mechanical-testing size, initial free-volume reduction with increasing the casting size of precursory-specimen also led to a degradation of plasticity as higher free-volume was required for higher shear band emission rate. Even the traditional BMG can be ductile as the casting size and mechanical-testing size of specimen were concurrently decreased to a certain extent. The understanding of the dual specimen-size dependences of plastic deformation capability of BMGs is helpful for the potential and reasonable engineering applications of BMGs.
机译：使用具有不同铸件尺寸并因此具有不同初始状态的先验试样，研究了Zr_（65）Cu_（17.5）Ni_（10）Al_（7.5）组成的传统BMG的塑性变形行为。随着试样力学测试尺寸的增加，证明了由于剪切带中引入了较大的剪切应变，试验机和试样的弹性回复率的更显着作用导致可塑性降低。此外，对于具有相同机械测试尺寸的试样，随着先验试样铸件尺寸的增加，初始自由体积的减小也导致可塑性的下降，因为更高的自由体积要求更高的剪切带发射速率。甚至传统的BMG也可以延展，因为同时减小了铸件尺寸和机械测试尺寸。对BMG塑性变形能力的双重标本大小依赖性的理解有助于BMG的潜在和合理的工程应用。

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  • 来源
    《Materials Science and Engineering》 |2009年第2009期|344-351|共8页
  • 作者

    Z.H. Han; L. He; M.B. Zhong; Y.L. Hou;

  • 作者单位

    State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, PR China;

    State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, PR China;

    State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, PR China;

    State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    bulk metallic glasses; plastic deformation; shear bands; free-volume; specimen-size effect;

    机译：大块金属玻璃;塑性变形;剪切带自由卷标本大小效应;

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