Effect of Different Alloying Elements on the Microstructure and Properties of Mg15Al High-magnesium Alloy

The microstructure and mechanical properties of Mg15Al-x(x= Zn,Nd,Si)alloy were investigated by OM and tensile property test respectively.The results showed that the primary α-Mg and β-Mg17Al12 phase in Mg15Al magnesium alloy were obviously refined in varying degrees by adding Zn,Nd,Si element.The needle-like Al11Nd3 phase emerges in Mg15Al1.5Nd alloy.Chinese-like and block Mg2Si phase were observed in Mg15Al1Si alloy.When Zn and Nd element were added into the Mg15Al magnesium alloy,the tensile strength was improved remarkably,increasing by 13.2% and 16.6%,respectively,while adding Si element the tensile strength of Mg15Al alloy decreased.The elongation of Mg15Al alloy increased by 140% due to adding of Nd element,however the elongation of Mg15Al alloy decreases after adding of Zn and Si.