Effect of stress states on the deformation behavior of Cu-based bulk metallic glass in the supercooled liquid region

The effect of stress states on the deformation behavior of the Cu ₅₄Zr₂₂Ti₁₈Ni₆ bulk metallic glass (BMG) alloy was studied in the supercooled liquid region. At 723 K, Newtonian plastic flow governed the deformation during the compression test, whereas strain-hardening occurred during the tensile test. At 733 K, a fast failure was observed during tensile test. The diffusion rate of Cu atoms in the BMG alloy plays an important role in the deformation behavior. The fast diffusion of Cu atoms under the tensile stress state caused faster crystallization leading to a fast strain-hardening during the tensile plastic deformation.