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A positron annihilation study of Al-Li alloys

The interaction and recovery of deformation induced defects has been studied by positron annihilation techniques in the Al-1.7 at.% Li and Al-9.9 at.% Li alloys. The samples have been deformed at liquid nitrogen and room temperatures for several deformation degrees. In the low temperature region (100-200 K and 200-400 K) the two recovery stages observed in pure Al and phenomena currently interpreted as divacancy and monovacancy migration are present in both alloys. However, it is observed that the presence of Li enhances the vacancy clustering. The effect observed in the high temperature region (400-600 K) in the higher Li content alloy has been interpreted as trapping of positrons by delta ' particles.