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Abstract The stress corrosion cracking (SCC) behavior of the AI-Li 8090 alloy sheet has been evaluated by using the slow strain rate technique(SSRT). The 8090 sheet was exposed to 3.5％NaCI solution under potentiostatic conditions and tested at different tensile strain rate. The most susceptible strain rate (1×10~(-6)·s~(-1)) and a critical potential (—800mV, SCE)have been observed. Aging conditions have great influence on the susceptibility to SCC, with underaged temper being the most susceptible, peak-aged temper being less susceptible and overaged temper being non-susceptible. By synthesizing the results and the fractographie characteristics, a conclusion can be drawn that anodic dissolution is generally the main mechanism of SCC. However hydrogen embrittlement may play a dominant role in the cracking mechanism, when hydrogen heavily permeats into the materials.
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Received: 25 February 1992
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