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Long Zhang,Ruiqing Lu,Jie Tang,Fulin Jiang,Dingfa Fu,Hui Zhang,Jie Teng 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.7
A continuously cast Al–Mg–Si–Cu alloy was processed by repetitive continuous extrusion forming (R-Conform) and thecorresponding deformation behaviors, microstructural evolution and mechanical properties were investigated systematicallyby combining uniaxial compression deformation, finite element simulation, microstructural observation and mechanicaltest. The results showed that the grain size of Al–Mg–Si–Cu alloy bar was gradually refined and became more uniformafter R-Conform processing with the increase of pass as a result of continuous dynamic recrystallization. The evolution ofmicrostructure was related to the complex thermomechanical conditions of temperature, shear rate and the distribution ofaccumulated strain during R-Conform process. Then the improvement of properties was obtained by the refined grains afterR-Conform processing. Further, the dense and fine precipitates formed after solution treatment and aging led to optimizedmechanical properties with tensile strength approximate 400 MPa and elongation about 17.8%.