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Metallic glasses are known to have a remarkably robust yield strength,admitting Weibull moduli as high as for crystalline engineering alloys.However, their post-yielding behavior is strongly varying, with large scatterin both flow stress levels and strains at failure. Using x-ray tomography wereveal for the first time how a strain-dependent internal evolution ofshear-band cavities underlies this unpredictable post yielding response. Wedemonstrate how macroscopic strain-softening coincides with the first detectionof internal shear-band cavitation. Cavity growth during plastic flow is foundto follow a power-law, which yields a fractal dimension and a roughnessexponent in excellent agreement with self-similar surface properties obtainedafter fracture. These findings demonstrate how internal micro-cracking coexistswith shear-band plasticity along the plastic part of a stress-strain curve,rationalizing the large variability of plastic flow behavior seen for metallicglasses.

Shear-band cavitation determines the shape of the stress-strain curve of metallic glasses