copper
The maximum solubility of copper in aluminum is 5.65%, and the solubility of copper is 0.45% when the temperature drops to 302. Copper is an important alloy element, which has certain solid solution strengthening effect, and CuAl2 has obvious aging effect. The copper content in aluminum alloy is usually 2.5% ~ 5%, and the copper content is the best when 4%~6.8%, so the copper content of most hard aluminum alloy is in this range. Aluminum copper alloy can contain less silicon, magnesium, manganese, chromium, zinc, iron and other elements.
silicon
The maximum solubility of silicon in solid solution was 1.65% when the eutectic temperature of Al - Si alloy was 577. Although solubility decreases with temperature, such alloys are generally not heat-treatable. Aluminum silicon alloy has excellent casting performance and corrosion resistance. If magnesium and silicon are added to aluminum to form the aluminum magnesium silicon alloy, the enhanced phase is MgSi. The mass ratio of magnesium and silicon is 1.73:1. When designing the composition of al-mg-si alloy, the content of magnesium and silicon is configured on the base. Some of the al-mg-si alloys, in order to increase the strength, add a moderate amount of copper, and add a moderate amount of chromium to offset the adverse effects of copper against corrosion.
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