The effect of prestrain and subsequent annealing on the mechanical behavior of AA5182-O

The effect of uniaxial tensile prestrain and subsequent annealing on the post-annealing mechanical properties (elongation, yield stress and strain-hardening exponent) of AA5182-O was investigated. Experiments were performed at four prestrain levels (5, 10, 15, and 20%) and three annealing temperatures (300, 350, and 400 °C), with holding times ranging from 5 s to 1 h. Empirical models for the yield stress of post-annealing AA5182-O were developed in terms of the applied prestrain, annealing temperature, and time for static recovery and recrystallization processes. The strain-hardening exponent was shown to have a linear correlation with the logarithm of yield stress. The above models can be used in formability analyses and forming process optimization.

Research highlights
► Two empirical kinetic models of yield stress were developed for post-anneal AA5182-O.
► Total effective elongation will increase with prestrain.
► Strain-hardening exponent (n) shows a linear relationship with log yield stress.
► The strength coefficient (K) has less dependence on prestrain and annealing.