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.
Received: 10 September 2006
Revised: 16 January 2007
Accepted manuscript online:
Fund: 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).
Cite this article:
Deng Yu-Fu(邓玉福), Yang Fei(杨飞), Yang Jian-Lin(杨建林), and Zhang Wei(张微） The increasing of localized free volume in bulk metallic glass under uniaxial compression 2007 Chinese Physics 16 2051
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