The increasing of localized free volume in bulk metallic glass under uniaxial compression |
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Authors: | Deng Yu-Fu Yang Fei Yang Jian-Lin and Zhang Wei |
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Institution: | College of Physical Science and Technology, Shenyang Normal University, Shenyang 110034, China |
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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. |
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Keywords: | amorphous materials electron microscopy plastic
deformation microstructure |
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