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Abstract
The fracture toughness and stress corrosion properties of forgings in four aluminium alloys (AA2014–T6, AA7075–T73, L83 WP and DTD 5084WP) have been compared, using precracked specimens to define KIscc (the critical stress intensity for stress corrosion cracking) for each alloy in the short transverse direction when tested in 3% sodium chloride solution. In the T73 condition of heat-treatment, alloy AA7075 was resistant to stress corrosion whereas the other three alloys all showed susceptibility to stress corrosion, the ratio KIscc to KIc being about 0·5 for the L83 WP and about 0·7 for the other two alloys.