Abstract
Fracture toughness and stress-corrosion cracking (SCC) behavior of Al-Li 2090-T8 and 2091-T8 alloys containing small amounts of Zn were studied and compared with conventional high-strength alloys 7075-T6 and 2024-T3. The fracture toughness value (KIC) and SCC extension rate (da/dt) as functions of stress intensity factor KI were evaluated using precracked DCB specimens with S-L orientation of the extruded plate. With Zn addition of 0.7%, 2090 and 2091 alloys showed little decrease of KIC and also superior SCC resistance as compared to conventional alloys in terms of the threshold value KISCC and (da/dt)II in region II. Fract graphic and electrochemical observations suggest that SCC of these Al-Li alloys is a result of local anodic dissolution along grain boundaries.
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