No abstract

No abstract

No abstract

No abstract

Posivon annihilation lineshape measurements are conducted on pure AI, AI-1.9 at.% Li and Al-(l2.0-12.5) at.% Li alloys. The recovery of each sample following quench andlor cold-work treatments is discussed in terms of vacancy migration and clustering. dislocation annealing and precipitation. The results indicate precipitation in both alloy concenmtions but no positmn trapping at dislocations. AU cold-worked alloys show large vacancy clustering effects, providing strong evidence of vacancy agglomeration at precipitates.