Synthesis and effect of Misch metal on mechanical properties of conventional cast Mg-Al-Zn-Sn-Pb alloy system

摘要

Magnesium alloys are increasingly accepted in automobile industry owing to their greater strength-to-weight ratio. These qualities lead to less vehicle weight and better fuel economy. Therefore, in the present work an effort has been made to develop a new Mg alloy system that exhibits greater ductility together with greater mechanical strength. Misch metal is added in Mg-based alloys to investigate the changes in mechanical properties. The microstructure of alloys Mg-4Al-3Zn-3Sn-3Pb (H1) and Mg-4Al-3Zn-3Sn-3Pb-0.5MM (H2) are dendritic in nature while for Mg-3Zn-3Sn-3Pb-2Si (H3) the Chinese script Mg2Si intermetallic structure was obtained. The ultimate tensile strength and elongation of Mg-4Al-3Zn-3Sn-3Pb-0.5MM (H2) alloy are about 40% and 100 % higher than that of H3 alloy. The ultimate tensile strength, yield strength, and percentage elongation of H2 alloy are 170MPa, 44MPa, and 3.4%, respectively.