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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