The fatigue strength and the fatigue crack propagation of Zr55Cu30Al10Ni5 bulk glassy alloys were examined using fully glassy plate shape samples produced by metallic mold casting. Fatigue testing was done under a tensile-tensile stress condition with a stress ratio R(σmax/σmin) = 0.5. As the results, we could confirm that the Wohler curve is different from those of ordinary crystalline structural alloys in that the fatigue strength decrease significantly from N = 103 to 104. Besides, the crack propagation rate of the samples were examined with macroscopic mechanical testing and microscopic fracture surface observation, and the both methods lead to the same result that the forced factor is about 2 with a power-law.
ASJC Scopus subject areas