Long-Time Aging Behaviour of the Alloy Al-2024 Characterized by Positron Annihilation Spectroscopy

T he reconstruction of the precipitati on structure after solution treatment has been in vesti gated by positron annihi lation spectroscopy .I n this study the behaviour of samples ta ken from an aircraf t \A irbus 300", being in op eration for 18 years, is compared to a ref erence material supplied by A lcoa.T he results of position annihil ati on spectroscopy show that there are no signi Ùcant di˜erences in b oth materials.T his Ùnding is in agreement w ith the results obtained from other metho ds w ithin the scop e of the general research program w hich points to a materials behaviour as predicted for a safe op eration of this typ e of aircraf t.