Abstract
Structural heterogeneities of metallic glasses at the nanoscale have been confirmed by many experiments. Some simulations indicate that these structural heterogeneities show a direct correlation with the initiation of shear bands. However, due to the limited experimental conditions, the detailed evolution from nanoscale heterogeneities to shear bands during deformation is still unclear. Here, a tensile platform coupled with in situ static force microscopy is designed to detect the evolution of nanoscale heterogeneous viscoelasticity during deformation in a CuZr metallic glass. We observe that the dominant viscoelastic mode changes from solid-like to liquid-like with increasing tensile strain, which displays the percolation-like character. Meanwhile, the correlation length of structural heterogeneities increases with strain, and the stripe-like shear bands form when the correlation length reaches a critical value. The current findings not only present a clear picture of the evolution of structural heterogeneities with stress but also reveal the microscopic deformation mechanism of amorphous materials.
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