Post-yield deformation characteristics in Al–Li alloys

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Abstract
The post-yield deformation characteristics of Al–Li–Cu–Mg–Zr alloys in the solution treated and naturally aged conditions have been investigated. Two essential features were observed: the existence of a region with no work hardening and pronounced serrations superimposed on the flow curve. The no work hardening regime is associated with the activation of a single slip system in unrecrystallised and textured material; activation of further slip systems and consequent hardening is assisted by natural aging. Serrated post-yield flow is attributed to the production of free dislocations from those pinned by lithium atom atmospheres; this form of serrated yielding is suppressed as the concentration of lithium solute falls during natural aging. MST/816