6061 alloy is the main alloying elements of magnesium and silicon, and the formation of Mg2Si phase. If a certain amount of manganese and chromium, and iron can be bad in the role; sometimes a small amount of copper or zinc added to improve tensile strength, without significantly reducing its corrosion resistance; there are still a small amount of conductive material copper, titanium and iron to offset the negative impact on the electrical conductivity; zirconium or titanium can refine the grain and control of recrystallization; to improve the cutting performance can be added lead and bismuth. In Mg2Si in, Mg / Si ratio of 1.73, in the heat treatment state, Mg2Si solid melting the aluminum in the alloy with artificial age hardening function.