中国物理B ›› 2007, Vol. 16 ›› Issue (7): 2051-2055.doi: 10.1088/1009-1963/16/7/041

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

The increasing of localized free volume in bulk metallic glass under uniaxial compression

邓玉福, 杨飞, 杨建林, 张微   

  1. College of Physical Science and Technology, Shenyang Normal University, Shenyang 110034, China
  • 收稿日期:2006-09-10 修回日期:2007-01-16 出版日期:2007-07-04 发布日期:2007-07-04
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No~10547127) and Experimental Center of Shenyang Normal University, China (Grant No~SY-200506).

The increasing of localized free volume in bulk metallic glass under uniaxial compression

Deng Yu-Fu(邓玉福)† , Yang Fei(杨飞), Yang Jian-Lin(杨建林), and Zhang Wei(张微）   

  1. College of Physical Science and Technology, Shenyang Normal University, Shenyang 110034, China
  • Received:2006-09-10 Revised:2007-01-16 Online:2007-07-04 Published:2007-07-04
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No~10547127) and Experimental Center of Shenyang Normal University, China (Grant No~SY-200506).

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摘要： Using transmission electron microscopy and electron diffraction, we have investigated the microstructure of a Zr55Al10Ni5Cu30 bulk metallic glass under a uniaxial compression until a failure occurs at room temperature. It is shown that the amorphous structure has changed locally in the vicinity of the failure plane after the plastic deformation. An increase in free volume is observed within the localized areas due to the concentration of plastic flow, suggesting that the increasing of local free volume dominates the deformation mechanism of the metallic glass. The effect of free volume on the `serrated flow' behaviour in the stress--strain curves during the uniaxial compression is discussed.

Abstract: Using transmission electron microscopy and electron diffraction, we have investigated the microstructure of a Zr55Al10Ni5Cu30 bulk metallic glass under a uniaxial compression until a failure occurs at room temperature. It is shown that the amorphous structure has changed locally in the vicinity of the failure plane after the plastic deformation. An increase in free volume is observed within the localized areas due to the concentration of plastic flow, suggesting that the increasing of local free volume dominates the deformation mechanism of the metallic glass. The effect of free volume on the `serrated flow' behaviour in the stress--strain curves during the uniaxial compression is discussed.

Key words: amorphous materials, electron microscopy, plastic deformation, microstructure

中图分类号:  (Glasses)

  • 61.43.Fs
62.20.F- (Deformation and plasticity) 81.40.Lm (Deformation, plasticity, and creep)