Abstract
Fracture mechanisms of metallic glasses are fundamentally different from that of crystalline alloys. Nano-voids formation and coalescence inside shear bands were believed to be one of the reasons causing the final failures. Although molecule dynamic simulations have successfully simulated cavitation in shear bands of brittle metallic glasses, direct experimental evidences are still rare. By carefully examining the shear bands of Pd40.5Ni40.5P19, nano-voids and their coalescence have been observed in the center-diffused region of shear bands. It is experimentally confirmed that nano-voids formation and their coalescence into large voids within shear bands is one of fracture mechanisms of metallic glasses.
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