Study on static strain aging of 6082 aluminium alloy

Abstract

In this study both the quench aging and static strain aging kinetics of a 6082 Al alloy were investigated at a temperature range of 130–200°C using the Vickers hardness and tensile test. The activation energy and dislocation density were determined at different stages of the aging phenomenon. The former was used to analyse the kinetics of aging and the latter to interpret the competition of strengthening and recovery mechanisms during aging. It is shown that different activation energies are achieved depending on the aging time and temperature relating to formation of appropriate precipitates at different stages of aging. Moreover, it is revealed that prestrain reduces the activation energy. A linear equation is proposed between the dislocation density and the plastic strain after static strain aging. The competition of recovery with strengthening mechanisms during strain aging is discussed with regard to dislocation density after aging.

Keywords

AL-MG-SI ALLOY QUENCH AGING STATIC STRAIN AGING PRECIPITATION ACTIVATION ENERGY DISLOCATION DENSITY

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