Aluminum alloy has low density, but its strength is relatively high, close to or higher than that of high-quality steel. Good plasticity, can be processed into various profiles, and has excellent electrical conductivity, thermal conductivity and corrosion resistance. It is widely used in industry, and its usage is second only to steel.
Some aluminum alloys can obtain good mechanical properties, physical properties and corrosion resistance through heat treatment. Hard aluminum alloy belongs to al-Cu-Mg system, generally containing a small amount of Mn, which can be strengthened by heat treatment. It is characterized by high hardness but poor plasticity. Deformed aluminum alloy is mainly aluminum-zinc-magnesium-silicon alloy. Although there are many kinds of elements added, the content is very small, so it has excellent thermoplasticity and is suitable for forging, so it is also called forged aluminum alloy.
Extended data
Melting and pouring of aluminum alloy are the main links in casting production. Strictly controlling the whole process of melting and casting plays an important role in preventing casting defects such as pinhole, inclusion, insufficient pouring, crack, porosity and shrinkage porosity.
The raw material for producing aluminum and aluminum alloys is primary aluminum. Metals with low strength and good plasticity of aluminum, except some pure aluminum, are alloyed to improve their strength or comprehensive properties. Adding an alloying element to aluminum can change its structure and properties, which is suitable for various processing materials or castings. The frequently added alloying elements are copper, magnesium, zinc, silicon, manganese and so on.
Baidu encyclopedia-aluminium alloy