Zinc is the main alloying element in 7075, adding magnesium to the alloy containing 3%-7.5% zinc can form MgZn2 with significant strengthening effect, making the heat treatment effect of the alloy far better than that of aluminum-zinc binary alloy.
Increase the zinc and magnesium content in the alloy, the tensile strength will be further improved, but its resistance to stress corrosion and spalling corrosion will be reduced.
Subjected to heat treatment, can reach a very high strength characteristics. 7075 materials are generally added to a small amount of copper, chromium and other alloys, the system to 7075T651 aluminum alloy in particular, known as the aluminum alloy in the best products, high strength, far better than any soft steel.