The acoustic emission power and energy accompanying the deformation of Al-4%Cu have been systematically studied as a function of ageing time at 170±5°C. The emission shows a strong dependence upon microstructure, a large peak in energy being observed after ageing for 1 to 2 h; this corresponded to a microstructure containing GP zones. A shear localization mechanism has been postulated to account for the ageing peak, in which pile-ups of dislocations are released during the cutting of GP(I) zones.
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