3545 Zr基バルク金属ガラスにおける疲労き裂の発生と伝ぱ(S12-2 環境効果および薄板材,S12 先進性金属材料の疲労特性と組織)

概要

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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.
社団法人日本機械学会の論文
2006-09-15