Abstract
Fracture toughness and SCC resistance of aluminium-lithium alloys 2090-T8 and 2091-T8 containing small amounts of zinc or indium were investigated, with the conventional alloys 7075-T6 and 2024-T3 being taken as references. The 2090 and 2091 alloys showed superior resistance to SCC propagation to that of the conventional alloys in terms of the threshold stress intensity K ISCC and plateau (region II) growth rate. On 0.4–0.7% zinc addition the SCC resistance was further improved while indium addition proved ineffective. Such an effect of minor element addition on SCC resistance is closely associated with susceptibility to a local anodic dissolution along grain boundaries.
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