Effects of nanocrystals on evolution behavior of shear transformation zones in Zr85Cu15 metallic glasses

LK Gao and SD Feng and L Qi and FL Zhao and RP Liu, JOURNAL OF NON- CRYSTALLINE SOLIDS, 419, 34-38 (2015).

DOI: 10.1016/j.jnoncrysol.2015.03.032

Structural evolution sites induced by shear stress and annealing were investigated via molecular dynamic simulations using a Zr85Cu15 metallic glass (MG) system. The crystalline phase induced by annealing occupies the preferred sites of shear transformation zones (STZs), forcing STZ formation in other parts of the amorphous matrix through deformation. This process fundamentally alters the path of shear bands in nanocrystal MGs. Meanwhile, more STZs are activated in the rest of the parts of the amorphous matrix when the volume fraction of nanocrystals is 13.5%, significantly enhancing the plasticity of nanocrystal-MGs. Our study may provide novel insights regarding the plastic deformation mechanism of nanociystal MGs at the atomic scale. (C) 2015 Elsevier B.V. All rights reserved.

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