For forging of aluminium alloys that needs to work at a temperature away, a small amount of transition group elements manganese, chromium, germanium, and titanium are usually added. These elements dissolve into the matrix to strongly increase the recrystallization temperature. When the dispersed second phase precipitates, it can be Effectively prevent the recrystallization process and grain growth. The recrystallization temperature is also an index reflecting the heat resistance.
Excessive alloying element content in the wrought aluminum alloy will cause a serious decline in the plasticity and corrosion resistance of the alloy process, and even make the pressure processing of the alloy difficult. Therefore, w(Cu) in the wrought aluminum alloy—generally no more than 5%, w(Mg) no more than 2.5%-5%, w(Zn) is 3%-8%, and w (Si)—generally 0.5%- 1.2%. Elements such as iron and silicon are harmful impurities in wrought aluminum alloys.