Abstract
The acoustic emission of AlCuMg and AlMg alloys during plastic deformation was studied. The emission characteristics of each alloy throughout the deformation range were significantly different. The Kaiser effect was invariably observed with an obvious correlation with previous stress. The 5086 alloy exhibited a “delayed Kaiser effect” due to strain-enhanced grain boundary segregation of excess magnesium. During plastic deformation of the 2024 alloy and the prestressed 5086 alloy, jerky discontinuous yielding was observed, with several plateaux of jerks appearing in the stress-strain curve. High acoustic bursts were observed at the onset of a new plateau of jerks owing to catastrophic breakaway of dislocations at regions of high stress concentration.
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