Thermal Stability, Glass-Formation Ability, and Mechanical Properties of (Zr41.2Ti13.8Cu12.5Ni10Be22.5)100?x Nb x Amorphous Alloys

摘要

Bulk amorphous alloys of (Zr41.2Ti13.8Cu12.5Ni10Be22.5)100?x Nb x with x = 0, 5, 11, and 13 were prepared by water quenching. Differential scanning calorimeter (DSC) analysis revealed that the addition of Nb enhances the thermal stability but appreciably decreases the glass-forming ability (GFA) of the alloys. Scanning electron microscope (SEM) and compression tests indicated that the Nb addition effectively improves the strength and plasticity of a Zr41.2Ti13.8Cu12.5Ni10Be22.5 amorphous alloy, which benefits from multiple shear bands induced by ductile crystalline phase dispersing in the amorphous matrix. The bulk amorphous alloy with x = 5 exhibits a fracture stress of 2070 MPa and total strain to fracture of 25.8 pct, respectively.