Wenner, S.; Matsuda, K.; Nishimura, K.; Banhart, J.; Matsuzaki, T.; Tomono, D.; Pratt, F.L.; Liu, M.; Yan, Y.; Marioara, C.D.; Holmestad, R.: Muon spin relaxation and positron annihilation spectroscopy studies of natural aging in Al-Mg-Si Alloys. In: 13th International Conference on Aluminum Alloys (ICAA13). Hasso Weiland, Anthony D. Rollett, William A. Casada, TMS, 2012, ICAA13, 2012, p. 37-42

Abstract:
Muon spin relaxation (μSR) is sensitive to magnetic elds from atomic nuclei, making it suitable for studying vacancies and solute clustering inside aluminium alloys. Positron annihilation spectroscopy (PAS) gives complimentary information about the electron density. We have conducted μSR and PAS experiments on an Al alloy with 1.07 at.% Mg and 0.53 at.% Si during natural aging after solution heat treatment. Three stages of positron lifetime change are visible, while the muon depolarization shows a decrease through the rst two of these. This is explained on the basis of vacancy migration, vacancy{solute binding and solute clustering.