Abstract
Abstract The role of Ag in the pre-precipitation process of an Al[sbnd]1.9 at.% Cu[sbnd]0.3at.% Mg[sbnd]0.2at.% Ag alloy has been investigated in view of the interaction between the quenched-in vacancies and Ag atoms. Positron annihilation methods, coincidence Doppler broadening of positron annihilation radiation and positron lifetime spectroscopies, and transmission electron microscopy have been employed. In an as-quenched state, quenched-in vacancies V in the Al[sbnd]1.9at.% Cu [sbnd]0.3 at. % Mg[sbnd]0.2 at. % Ag alloy are associated with Ag atoms as well as Mg atoms (V[sbnd]Mg[sbnd]Ag) while V[sbnd]Mg complexes are formed in the Al[sbnd]1.9 at. % Cu[sbnd]0.3 at. % Mg alloy. The recovery of the vacancies after 15s ageing at 180°C is suppressed by the existence of Ag atoms. These results indicate that the V[sbnd]Mg complexes are stabilized by the associated Ag atoms, which promotes the co-clustering of Ag and Mg atoms by ageing rather than by the formation of dislocation loops.
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