Microstructure evolution and tensile behavior of balanced Al?Mg?Si alloy with various homogenization parameters
The effects of homogenization parameters on the microstructure evolution and tensile behavior of a balanced Al−Mg−Si alloy were investigated using the optical microscope,scanning electron microscope,X-ray diffraction,electron probe microanalyzer,differential scanning calorimetry,electrical conductivity test,and tensile test. The results show that Mg2Si and β-AlFeSi are the main intermetallic compounds in the as-cast structure,and Mg solute microsegregation is predominant inside the dendrite cell. The prediction of the full dissolution time of Mg2Si by a kinetic model is consistent with the experiment. The β-AlFeSi in the alloy exhibits high thermal stability and mainly undergoes dissolution and coarsening during homogenization at 560 ℃,and only a small portion is converted toα-AlFeSi. The optimal homogenization parameters are determined as 560 ℃ and 360 min,when considering the evolution of microstructure and resource savings. Both the strength and ductility of the alloy increased after homogenization.
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