Malleable Hypoeutectic Zr-Ni-Cu-AI Bulk Glassy Alloys with Tensile Plastic Elongation at Room Temperature

摘要

A new bulk glassy alloy (BGA) showing macroscopic tensile plastic elongation at room temperature has been developed in hypoeutectic Zr-Ni-Cu-AI alloys with high Poisson's ratio and low Young's modulus. Hypoeutectic Zr_(70)Ni_(16)Cu_6Al_8 BGA exhibits the highest Poisson's ratio of 0.39 and the lowest Young's modulus 73 GPa, a distinct tensile plastic elongation of about 1.7 % and room temperature malleability in compression without fracture. The highly ductile nature seems to originate from modifications in the medium-range atomic order in hypoeutectic region.