Modeling of dislocation density and strength on rheoforged A356 alloy during multi-directional forging

•A combination of Shear Lag model and Nes model is presented.•The model is used for non-dendritic A356 alloy during multi-directional forging.•Modeling results of dislocation density and strength are acceptable.•The model in this case is less sensitive to variation of Si particles aspect ratio.

In this study, a hybrid model is presented to predict the dislocation density and strength evolution of the rheoforged non-dendritic A356 alloy during multi-directional forging. Regarding the characteristics of non-dendritic A356 alloy, combination of Shear Lag and Nes models is used for the eutectic structure, and Nes model is used for the α-Al globular phase. The aspect ratio variations of Si particles in eutectic structure during 3 passes of multi-directional forging do not change the model predictions, significantly. Model predictions on shear stress are in good agreement with experimental results of shear punch test.