Abstract
Metallic glasses (MGs) or other amorphous materials often yield macroscopically with the instantaneous formation of shear bands under the applied stresses. Here, through microcompression tests, we showed that, below the conventional yield stress, shear banding can still be activated but requires an incubation time. The incubation or delay time is found to be closely related to the level of the applied stress. From a dynamic evolution model entailing the plastic deformation units in MGs, the delayed shear banding behavior is modeled as a result of the spatial evolution of the local internal plastic flow.
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