발간논문

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Vol.27, No.8, 748 ~ 756, 1989
Title
The Effect of thermomechanical Treatment of 7050 Al Alloy on Stress Corrosion Susceptibility and Mechanical Behavior in Overaged Temper
김병삼Byoung Sam kim, 이진형Jin Hyung Lee, 정영훈Young Hoon Chung, 신명철Myung Chul Shin
Abstract
The effect of plastic deformation in thermomechanical treatment on the strength and stress corrosion crack propagation of overaged 7050 Al alloy was investigated by examining mechanical properties, clack growth rates and microstructure. As the amount of plastic deformation increased, the strength and the stress corrosion susceptibility decreased and the susceptibility of SCC was not influenced considerably by the amount of plastic deformation in the range of above 5% reduction ratio in area. The strength deterioration was attributed to the coarsening of precipitates in the matrix which was accelerated by the plastic deformation, while the SCC characteristics was due to the preservation of precipitates morphology in the brain boundaries in spite of increasing plastic deformation. This is thought to be resulted from the difference of dislocation densities at the matrix and the grain boundaries.
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