Modification of A356 Aluminum Alloy by Lanthanum-Cerium Mixed Addition
The effects of mixed additions of La and Ce in the range of 0～0.35％on the microstructure and mechanical properties of A356 aluminum alloy were investigated by metallographic microscope,tungsten filament scanning elec-tron microscope and field emission scanning electron microscope.The results reveal that optimal microstructure and mechanical properties of A356 aluminum alloy are obtained with mixed rare earth addition of 0.35％,and the equiva-lent diameter and SDAS value of α-Al grains reach the minimum value of 24.24 μm and 38.07 μm,respectively,with the satisfied eutectic silicon refinement.The tensile strength and yield strength reach the maximum values of 178.5 MPa and 145.6 MPa,and the fracture type is gradually changed from brittle fracture to ductile fracture.
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