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We study the tensile deformation behaviour of metallic glassCu$_{50}$Zr$_{50}$ as a function of quenching rate using molecular dynamicssimulations. The atomic scale shearing is found to be independent on atomicfree volume, and the macroscopic correlation between the yield strength and thedensity (or average free volume) is a coincidence that the samples with largefree volume also have a low density of shear-resistant local five-foldsymmetry. In the relatively slowly quenched ($\leq 10^{10}$ K/s) samples, shearbands have a dilatation about 0.5\%, which compares well with recent experimentresults. In contrast, although more active local shearing occurs in the rapidlyquenched samples, shear bands are not observed. This is because the strainenergy disperses into local atomic shearing at the macroscopically elasticstage and, hence, is not sufficient for shear band activation, resulting inhomogeneous deformation and appreciable plasticity.

Formation and dilatation of shear bands in a Cu-Zr metallic glass: A free volume perspective