Abstract
The hardening behavior of heat treatable alloys during deformation is attributed to three mechanisms of forest dislocations, solid solution and precipitation hardening which hinder the motion of dislocations and increase the density of statistically stored dislocation. In this paper, a model for the flow stress of a 2024 heat treatable aluminum alloy during plastic deformation is developed combining the superposition of these three hardening mechanisms. This model was then implemented into the finite element model in order to evaluate the evolution of the flow stress of 2024 aluminum alloy during multi-directional forging (MDF). Subsequently, an equation is developed for evaluating the material strength changes during natural aging after MDF. The experimental results from compression and hardness tests show a good agreement between modeling and experimental data. The results show that the flow stress is increased about 90% after the first pass of MDF and then increased just about 2% after the second pass. Through natural aging process, the hardening rate is higher in non-deformed samples and is decreased with increasing the aging time.
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