발간논문

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Vol.27, No.1, 60 ~ 70, 1989
Title
The Effect of TMT on Fatigue Crack Propagation in 7050 Al Alloy
조준식Joon Sic Cho, 권숙인Sook In Kwun, 정영훈Young Hoon Chung, 이룡연Yong Youn Lee
Abstract
The effect of TAHA treatments involving pre-aging, plastic deformation and final-aging on the fatigue crack propagation near ΔK_(th) in 7050 Al alloy was investigated. The TAHA treatments could improve the ΔK_(th) value nearly 10% without sacrifice of the tensile properties when compared to the conventional T6 treatment. The fatigue crack propagation rate near threshold was studied using the ΔK decreasing method. The crack growth rate near ΔK_(th) in T6 and TMT treatments markedly decreased as ΔK decreased compared to that in T74 treatment. This is thought to be resulted from the roughness-induced crack closure due to the planarity of slip caused by shearability of precipitates and the crack deflection. The ΔK_T transition values and the degree of roughness-induced crack closure were thought to be the controlling parameters to determine the ΔK_(th) values in this alloy.
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