Abstract
This study is concerned with crack origin of 8090 Al-Li alloys tensile tested. Particular attention has been given on grain boundary crack or delamination. It has been shown that the origin of the fracture is due to a strong slip localisation on a one single slip system and to the appearance of a sinuous and coarse slip probably resulting from incompatible strains between adjacent grains, whatever the ageing conditions. Also, it has been shown that the intergranular precipitation increases the risk of intergranular cracks. But the slip localisation seems to be responsible for the delamination initiation. In the case of underaged condition a quantitative analysis from a model of dislocations piled up against grain boundary has been developed. This approach agrees with experimental results
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