발간논문

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Vol.27, No.8, 756 ~ 764, 1989
Title
Tensile Properties and Stress Corrosion Cracking of Pre - deformed Superplastic 7075 Aluminum Alloy
최해창Hea Chang Choi, 신동혁Dong Hyuk Shin, 맹선재Sun Chae Maeng
Abstract
Standard 7075 aluminum alloy was thermonecharically processed via the method by Paton to obtain superplasticity. The alloy was then pre-deformed under superplastic deformation condition and heat-treated to T-6 condition prior to tensile test and stress corrosion cracking test. By increasing the degree of pre-deformation above 60 % elongation, both the strength and elongation have decreased. Stress corrosion cracking sensitivity was increased by the increased pre-deformation. Cavitations, which was formed during the predeformation processing, deteriorated the tensile properties and increased stress corrosion cracking sensitivity with the amount of pre-deformation. Microstructure at the grain boundaries also affected to deteriorate tensile properties and SCC resistivity.
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