Effect of structural heterogeneity on the shear-band propagation mechanism in soft-hard dual-phase metallic glasses
In this paper,the shear band propagation mechanism in the soft-hard heterogeneous metallic glass during tensile deformation is investigated using molecular dynamics simulations.Upon percolating from the soft phase to the hard phase,the shear band will stagnate at the interface between these two phases and alter its propagation direction during subsequent shearing.The structural difference leads to the asynchronous yielding of the soft-hard two phases and consequently causes the discontinuous propagation of the shear band.Furthermore,the inhomogeneous nature of the microstructure in the hard phase gave rise to stress and local entropy heterogeneity,resulting in the predilection of shearing in the areas of high stress and high local entropy.This work deepens the understanding of the shear band propagation mechanism in heterogeneous metallic glasses and provides a foundation for designing high-performance amorphous alloys.
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