Abstract
Processing material in the semisolid state has the advantage of a low energy requirement in comparison to processing in the solid state. In this study, a simple rod compression test of AL6061 alloy in the semisolid state is experimentally investigated with solid volume fractions of 0.6, 0.7, 0.8, and 0.9 and various ram speeds of 2, 5, and 7 mm/min. Also, commercial Deform-3D finite-element software is used to model the forging process of a cylindrical rod. In all simulations, the material model in macroscopic behavior with various solid volume fractions is considered as viscoplastic when its liquid volume fraction is ignored. The Sellars and Tegart constitutive model is used to determine the material behavior in this state. The experimental and simulation results show that the compression force increases with an increase in both the solid volume fraction and ram speed. By analyzing the results of compression force, it can be claimed that the maximum difference between ram speeds of 2 and 7 mm/min at 862 K (589 °C) is around 27 pct, while the maximum difference between 862 and 883 K (589 °C and 610 °C) at a minimum ram speed of 2 mm/min is around 15 pct. So the strain rate of deformation has a greater effect than temperature in semisolid deformation.
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