Effect of Sr Modification Treatment on Microstructure and Mechanical Properties of ZL105 Alloy

Author of the article:SUN Wenyang

Author's Workplace：AECC Xi'an Aero Engine Ltd., Xi'an 710021, China

Key Words：ZL105 Alloy; Sr modification; eutectic silicon

Abstract：ZL105 was modified by Al-Sr master alloy. The effect of modification on the mechanical properties and microstructure of ZL105 alloy was studied by means of fracture analysis, tensile test and metallographic analysis. The results show that after modification, the bright spot of the silicon in the fracture structure of ZL105 alloy disappears obviously, the tensile strength and hardness are improved, and the elongation is improved obviously. The eutectic silicon edges and corners of the metallographic structure passivate from needle and sheet to short rod and granular, and the modification effect is the best when the amount of SR is 0.04%