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

摘要

High-cycle fatigue (HCF) experiments were conducted on zirconium (Zr)-based bulk-metallic glasses (BMGs): Zr_(50)Cu_(40)Al_(10), Zr_(50)Cu_(30)Al_(10)Ni_(10), Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5), and Zr_(50)Cu_(37)Al_(10)Pd_3 (in atomic percent) in air. The fatigue-endurance limit of Zr_(50)Cu_(37)Al_(10)Pd_3 was significantly greater than those of Zr_(50)Cu_(40)Al_(10), Zr_(50)Cu_(30)Cu_(30)Al_(10)Ni_(10), and Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(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.