1. Pure aluminum
(1) Impurity elements: All impurity elements will reduce the conductivity of aluminum
(2) Iron and silicon: If iron and silicon coexist in aluminum, the plasticity and corrosion resistance of aluminum will be reduced
(3) Copper: Copper reduces the corrosion resistance of aluminum
(4) Zinc: Zinc also reduces the corrosion resistance of aluminum
2. Deformed aluminum alloys
(1) Copper and magnesium: Copper can significantly improve the strength and hardness of aluminum alloys. In addition to improving strength and hardness, magnesium mainly improves the corrosion resistance of aluminum alloys. Copper and magnesium work together to strengthen aluminum alloys through quenching and aging.
(2) Zinc: Zinc can improve the aging strengthening effect of aluminum alloys and improve machinability and thermoplasticity, but it reduces fatigue strength and intergranular corrosion resistance.
(3) Manganese: Manganese can mainly improve the strength of aluminum alloys.
(4) Titanium and boron: Titanium and boron can refine the grain size of the alloy and improve its strength.
(5) Silicon: Silicon can improve the thermoplasticity of aluminum alloys and enhance their heat treatment strengthening effect.
(6) Iron and nickel: Iron and nickel can improve the strength of wrought aluminum after quenching and aging.
3. Cast aluminum alloys
(1) Silicon - Silicon can improve the fluidity, strength and corrosion resistance of cast aluminum alloys, reduce shrinkage and cracks
(2) Copper and magnesium - Copper and magnesium can improve the strength and hardness of aluminum alloys through quenching and aging. Copper can also improve its fluidity, while magnesium has the opposite effect, but it can improve its corrosion resistance
(3) Zinc - Zinc can improve the castability and strength of cast aluminum alloys, but reduce its corrosion resistance
(4) Nickel - Nickel can improve the thermal strength of cast aluminum alloys