Abstract
The evolution from initiation to formation of a shear band in Zr46Cu46Al8 metallic glasses is presented via molecular dynamics simulation. The increase in number and the decrease in average size of clusters with the quasi-nearest atoms being 0 correspond to the shear-band evolution from initiation to formation. When the shear band is completely formed, the distribution of the bond orientational order q6 reaches a minimum. The maximum of the number of the polyhedral loss of Cu-centered <0, 0, 12, 0> and the minimum of the number of the polyhedral loss of Zr-centered <0, 2, 8, 5> correspond to the shear-band formation. These findings provide a strong foundation for characterizing the evolution from initiation to formation of shear bands.
Highlights
The shear band plays a decisive role in controlling the deformation of metallic glasses (MGs) at room temperature, in which large plastic strain is concentrated [1,2,3]
Shear transformation zone (STZ)-clusters originate from local atomic regions and intertwine with each other when forming a nascent shear band [5,6]
Our preliminary results indicate that Zr-centered Voronoi polyhedra (VP) tend to for the number of polyhedral loss of Zr-centered at a strain of 6% suggests that the shear be connected with each other, forming an interpenetrating backbone in the shear band
Summary
The shear band plays a decisive role in controlling the deformation of metallic glasses (MGs) at room temperature, in which large plastic strain is concentrated [1,2,3]. A shear-band process includes formation, propagation, and arrest [4]. The deceleration before reaching the maximum shear-band speed provides evidence to suppress the propagation, causing shear-band arrest [4]. Due to space and time constraints, constraints, the initiation to formation of a shear band is still unknown. There is an urgent need to need to understand the evolution from initiation to formation of shear bands in MGs at the atomic understand the evolution from initiation to formation of shear bands in MGs at the atomic level. On shear-band formation were investigated in Zr46 Cu46 Al8 MGs
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