Low tempterature internal friction peaks in cold-worked Al-Mg solid solutions were sys-tematically studied. Two internal friction peaks were observed around - 70℃ (PL2 peak) and - 50℃ (PL1 peak) when measured with a frequency of about IHz. Effect of magnesium con-tent, amount and mode of cold-working, type of solute atoms, and annealing on the appearan-ce and behavior of these two peaks were examined. Conclusions were reached thai PL2 peaks is associated with the interaction of dislocations with ‘Mg atom-divacancy' pairs and PL1 peak is associated with the interaction of dislocations with ‘Mg atom-vacancy' pairs.
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