Compressive behavior of Ti₄₀Zr₂₅Ni₈ Cu₉Be₁₈ bulk metallic glass at cryogenic temperature

The compressive mechanical behaviors of the Ti₄₀Zr₂₅Ni₈ Cu₉Be₁₈ bulk metallic glass (BMGs) at cryogenic temperature and different strain rates were investigated, and the mechanical properties at temperature and different strain rate were compared with those at room temperature. The results show that the compressive strength at cryogenic temperature is higher than that at room temperature, the compressive strength at cryogenic temperature increases linearly with increasing strain rates, and the positive strain rate sensitivity exponent increases. The observed smooth failure surface demonstrates that the cryogenic temperature effectively restrains the decrease of the viscosity, and the decreased viscosity do not reach the requirement of forming the vein-like patterns, which is different from that of the deformation character at room temperature. With increasing strain rate, the appearance of vein-like patterns reveals that high strain rates can decrease the viscosity of shear surface.