3545 Fatigue Crack Initiation and Propagation in Zr-based Bulk Metallic Glass
Details
In the present study, fatigue tests of Zr-based bulk metallic glass, Zr_<55>Cu_<30>Ni_5Al_10, were conducted, under fully reversed cyclic bending (R=-1), and the surfaces of the fatigued specimen were observed to elucidate the fatigue crack initiation mechanisms. From the surface observations of the fatigued specimen, a shear band was observed at the crack initiation site just after the crack initiation, but not before. The fatigue crack propagation tests were also conducted to examine the effect of stress ratio and loading frequency. The fatigue crack propagation rate was found to be controlled by the stress intensity range, ΔK, or its effective component, ΔK_<eff>, independent of the stress ratio and the loading frequency.
