Studying fatigue behavior and Poisson's ratio of bulk-metallic glasses

Abstract

High-cycle fatigue (HCF) experiments were conducted on zirconium (Zr)-based bulk-metallic glasses (BMGs): Zr 50Cu 40Al 10, Zr 50Cu 30Al 10Ni 10, Zr 41.2Ti 13.8Cu 12.5Ni 10Be 22.5, and Zr 50Cu 37Al 10Pd 3 (in atomic percent) in air. The fatigue-endurance limit of Zr 50Cu 37Al 10Pd 3 was significantly greater than those of Zr 50Cu 40Al 10, Zr 50Cu 30Al 10Ni 10, and Zr 41.2Ti 13.8Cu 12.5Ni 10Be 22.5. The resonant ultrasound spectroscopy technique was employed to determine the Poisson's ratios, shear moduli, and bulk moduli of these BMGs. The ratio of the fatigue-endurance limit to the tensile strength increases with increasing Poisson's ratio. A possible relationship between the ratio of the fatigue-endurance limit to the tensile strength and the ratio of the shear modulus to the bulk modulus or Poisson's ratio will be discussed.