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The Deformation-Semi-Solid-Forming (D-SSF) process has been developed to produce superior semi-solid microstructures of fine ¡-Al grains and refined intermetallic compounds. The wrought Al­Mg­Si (6xxx alloys) alloys are generally considered to be complicated in controlling the semi-solid forming process because of the high temperature sensitivity to the liquid fraction. Additional alloying elements to the 6xxx series aluminum alloys are usually required to produce second-phase particles in order to refine the spheroidized ¡-Al grains during the reheating process. Generally, the ¢-Mg2Si phase is precipitated in the supersaturated Al matrix with Mg and Si atoms at various heat treatments in the manufacturing process of Al­Mg­Si alloys. In this study, the annealing process was performed for the precipitation of the equilibrium ¢Mg2Si phase. By applying mechanical deformation, the stored energy is much increased by the presence of the rod-like ¢-Mg2Si precipitates, which accelerates recrystallization during heating to the semi-solid state. Fine ¡-Al grains with the average size of 104μm were achieved by annealing and 60% cold-rolling in the alloy without additional alloying elements. The coarsened harmful Fe-intermetallic compounds were fragmented and became effective particles to refine the ¡-Al grains. Moreover, the combination of the fragmented Fe-intermetallic compounds and ¢-Mg2Si precipitates can further refine the ¡-Al grains with the average size of 79 μm by annealing and 40% cold-rolling. [doi:10.2320/matertrans.M2012339]

materials transactions

Effects of &beta;-Mg<sub>2</sub>Si Precipitates on Semi-Solid Microstructures of Wrought Al&ndash;Mg&ndash;Si Based Alloys Produced by Deformation-Semi-Solid-Forming Process

Effects of β-Mg2Si Precipitates on Semi-Solid Microstructures of Wrought Al–Mg–Si Based Alloys Produced by Deformation-Semi-Solid-Forming Process

Effects of β-Mg₂Si Precipitates on Semi-Solid Microstructures of Wrought Al–Mg–Si Based Alloys Produced by Deformation-Semi-Solid-Forming Process