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We report a wavelike fracture pattern in a Zr-based bulk metallic glass thathas been deformed under quasi-static uniaxial tensions at temperatures betweenroom temperature (300 K) and liquid nitrogen temperature (77 K). We attributethis wavelike pattern to a Kelvin-Helmholtz flow instability that occurred atcertain interfaces between local cracking/softening regions. The instabilitycriterion for the pattern formation is achieved via a hydrodynamic perturbationanalysis, and furthermore an instability map is built which demonstrates thatthe shear velocity difference on both sides of the interface is the maindestabilizing factor. Finally, the characteristic instability time (the inverseof the instability growth rate) is explored by seeking the dispersion relationin the dominant (fastest) instability mode. The results increase theunderstanding of the flow and fracture of metallic glasses as well as thenature of their liquid structures.

Wavelike fracture pattern in metallic glasses: a Kelvin-Helmholtz flow instability