Deformation and failure of Zr_57Ti_5Cu_20Ni_8Al_10 bulk metallic glass under quasi-static and dynamic compression

We have examined the mechanical behavior of Zr 5 7 Ti 5 Cu 2 0 Ni 8 Al 1 0 bulk metallic glass under uniaxial compression at strain rates from 10 - 4 to 3 x 10 3 s - 1 . The failure stress decreases with increasing strain rate, and shear-band formation remains the dominant deformation mechanism. A consideration of basic properties of adiabatic shear bands makes it appear unlikely that shear bands formed under quasi-static loading are adiabatic; in the dynamic case, the time scales of deformation and thermal conduction are similar, indicating that a more sophisticated calculation is required. In the dynamic tests, however, high-speed cinematography reveals evidence that the mechanism of failure involves an adiabatic component.

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