Abstract
The mechanical properties of two different conditions of an Al-Li 8090 alloy has been studied at room temperature and 77K. One condition with a wide precipitate free zone adjacent to the grain boundaries, the other condition without PFZ's. The former had a fine distribution of 8′ and S′ precipitates, whereas in condition B the S′-phase was almost absent. The two microstructures resulted in different properties and deformation mechanisms in tension and in ordinary KIC tests. In general, the PFZ free condition had the highest strength, ductility and work hardening capability. The intrinsic crack growth resistance was only slightly different while the PFZ containing alloy had a more pronounced crack closure behavior. A model for KIC calculations has been developed for the slip band decohesion mechanism.
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