Cold-rolled Zr₅₀Cu₃₀Ni₁₀Al₁₀ bulk amorphous alloys with tensile plastic elongation at room temperature

Controlling the cold-rolled structure of the shear-band network in Zr₅₀Cu₃₀Ni₁₀Al₁₀ bulk amorphous alloys can enhance the tensile plastic deformability at room temperature Cold-rolling is useful for controlling the shear band network structure in bulk amorphous alloys. The cold-rolled structure in a bulk amorphous alloy is classified into two regions, the deformed shear-band region and non-deformed block region. Since the pre-deformed shear-band region moves more easily than the non-deformed region, the pre-deformed shear-band network movement is able to release applied tensile strain. Consequently, plastic tensile strain can be obtained in a cold-rolled bulk amorphous alloy by systematical movement of the shear-band network. In this study, we obtained a maximum tensile plastic strain of about 0.25% in 10% cold-rolled Zr₅₀Cu₃₀Ni₁₀Al₁₀ bulk amorphous alloy. The tensile fracture surface was composed of many step marks leading to the pre-introduced shear band movement.