Research on mechanical property of Al-Mg-Si-Cr-Zr-Sc alloy in the state of deformation treatment condition

Al-Mg-Si-Cr-Zr-Sc alloy was fabricated with different Sc element addition by operating in refining treatment. The tiny phase forming in Al-5.2%Mg-0.8%Si-0.25%Cr-0.1% Zr-xSc alloy and its strengthening methods were analyzed using SEM and optical microscopy. The micro-structural analysis concludes that it can effectively refine the structure unite of Al-abased alloy with the 0.2% rare earth Sc element. When the additional amount of Sc amounts to 0.2%, the yield and tensile strength of the alloy reach the maximum peaks of 235MPa and 280MPa. Al-5.2%Mg-0.8%Si-0.25%Cr-0.1%Zr-xSc alloy shows a stable cyclic state when the total applied amplitude strain is t/2=0.6%, the loop of hysteresis shows a smooth curve; When the total applied amplitude strain is t/2≥0.8%, the tension and compression parts of the hysteresis cyclic deformation loop show obvious zigzag undulation.