STRESS-CORROSION TESTING OF A SUPERPLASTICALLY DEFORMED ALUMINUM-LITHIUM ALLOY

An investigation was conducted to study the stress corrosion cracking (SCC) tendency of a superplastically deformed aluminum-lithium-based a lloy (AA X2094 [UNS A92094]) that had been received in a thermomechani cally processed form suitable for dynamic recrystallization. Tensile s pecimens made from sheets of this material were superplastically defor med at a constant true strain rate of 2 x 10(-4)/s and a temperature o f similar to 500 degrees C. Specimens then were subjected to stress co rrosion testing using the slow strain rate tensile testing (SSRT) tech nique at a constant initial strain rate of 2 x 10(-6)/s. Effects of di fferent superplastic deformation variables and stress corrosion testin g conditions on the stress-strain relationship of the test specimens w ere studied.