6061 is a common duralumin with good machinability and moderate strength. 6061 is a heat-treatable alloy with good formability, weldability, machinability, and moderate strength. It can still maintain good operation after annealing.
The main alloying elements of 6061 alloy are magnesium and silicon, and form Ma2Si phase. If there is a certain amount of manganese and chromium, the bad effect of iron can be neutralized. Sometimes add a small amount of copper or zinc, in order to improve the strength of the alloy, and do not make its corrosion resistance has a significant reduction, there is a small amount of copper in the conductive material, to offset the bad effect of titanium and iron on electrical conductivity; Zirconium or titanium can refine grain and control recrystallization structure. Lead and bismuth are added to improve machinability. Mq2Si is solidly dissolved in aluminum, which makes the alloy have artificial age hardening function.

Aluminum is a silver-white light metal, relatively soft, density 2.7g/cm3, melting point 660.4℃, boiling point 2467℃, aluminum and aluminum alloys have many excellent physical properties, has been very widely used. Aluminum has good reflection performance of light, reflecting ultraviolet light is stronger than silver, the purer aluminum is, its reflection ability is better, and the method of vacuum aluminum plating is commonly used to make high-quality mirrors. Vacuum aluminized film combined with polysilicon film becomes a cheap and lightweight solar cell material. Aluminum powder can maintain a silvery luster, often used to make paint, commonly known as silver powder. Pure aluminum conducts electricity very well, second only to silver and copper. In the electric power industry, it can replace part of copper for wires and cables. Aluminum is a good conductor of heat. It can be used to make various heat exchangers, heat dissipating materials and civil cookers in industry. Aluminum has good ductility, can be drawn into a fine wire, rolled into a variety of aluminum products, but also can be made into thinner than 0.01mm aluminum foil, widely used in packaging cigarettes, candy, etc.. Aluminum alloy has some better properties than pure aluminum, which greatly expands the application range of aluminum. For example, pure aluminum is soft, when a certain amount of copper, magnesium, manganese and other metals are added to aluminum, the strength can be greatly improved, almost equivalent to steel, and the density is small, not easy to rust, widely used in aircraft, cars, trains, ships, artificial satellites, rockets manufacturing. At -196 ° C, some steel is as brittle as glass, while some aluminum alloys increase in strength and toughness, making them cheap and lightweight cryogenic materials that can be used to store liquid oxygen and hydrogen for rocket fuel.

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