1. Control of shear band dynamics in Cu50Zr50 metallic glass by introducing amorphous-crystalline interfaces.
- Author
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Feng, S.D., Li, L., Chan, K.C., Qi, L., Zhao, L., Wang, L.M., and Liu, R.P.
- Subjects
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COPPER-zinc alloys , *AMORPHOUS substances , *INTERFACES (Physical sciences) , *MOLECULAR dynamics , *SHEAR (Mechanics) , *METALLIC glasses - Abstract
Abstract The effects of interfaces in crystalline Cu/amorphous Cu 50 Zr 50 on shear banding dynamics are investigated using molecular dynamics simulations. The results show that the introduction of amorphous-crystalline interfaces can effectively promote the homogeneous distribution of shear transformation zones (STZs). We found that the high potential energy combined with the defects of the interfaces promote the nucleation of STZs. Further, the amorphous-crystalline interfaces are transition regions that mediate the transmission of dislocations in the crystallites into STZs in the metallic glasses. The accumulation of STZs and dislocations at the interfaces provide the sources for the enhanced plastic deformation in nanocomposites. These results allow us to determine the fundamental atomic structure of amorphous-crystalline interfaces in nanocomposites. Graphical abstract Image 1 Highlights • The effects of the glass/crystalline interfaces on shear banding dynamics were investigated. • The simulations reveal, for the first time, the atomic structure of interfaces by QNA. • The interfaces reduced the stress drop values of the nanocomposite by a maximum of 54%. • This simulation can predict the deformation modes with different interfaces. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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