Properties of Pure Aluminum and Aluminum Alloys


Aluminum is currently the most widely used material for electronic radiators. The properties of aluminum are well suited for making radiators. Good thermal conductivity and low price.

The following describes the characteristics of pure aluminum and aluminum alloys used in the cooling industry

1、Pure aluminum: density: aluminum is a very light metal, density of 2.71 grams/cm 3, about 1/3 of pure copper.

Conductivity: aluminum has good conductivity and conductivity. When the cross-section and length of aluminum are the same as that of copper, aluminum’s conductivity is about 61% of that of copper. If the weight of aluminum and copper are the same and the cross-section is different (the length is the same), aluminum’s conductivity is 200% of copper.

Chemical properties: good resistance to atmospheric decay, because its surface is easy to form a dense alumina film, can prevent further oxidation of internal metal, aluminum and concentrated nitric acid, organic acid and food basic reaction. Aluminum has a face-core cubic structure, and the pure aluminum for industrial use has a high plasticity (ψ=80%), which is easy to withstand various molding processes. However, its strength is too low, σb is about 69Mpa, so the pure aluminum can only be used as structural material after cold deformation strengthening or alloying to improve its strength.

Aluminum is a non-magnetic, sparkless material with good reflectivity, reflecting both visible and ultraviolet light. The impurities in aluminum are silicon and iron. When the impurity content is higher, the conductivity, corrosion resistance and plasticity are lower.

2、Aluminum alloy, if add the right amount of certain alloying elements in aluminum, after cold working or heat treatment, can significantly improve certain features, more frequently used in aluminum alloy elements for copper, magnesium, silicon, manganese, zinc, these elements are sometimes join alone, sometimes cooperate to join, in addition to the above elements, sometimes adding trace amounts of titanium, boron, chromium, etc. According to the composition and production process characteristics of aluminum alloy, it can be divided into casting aluminum alloy and deformation aluminum alloy. Deformation aluminum alloy: this kind of aluminum alloy is usually processed by hot or cold state pressure, that is, after rolling, extrusion and other processes, made of plate, pipe, bar and various profiles, this kind of alloy requirements have quite high plasticity, so the alloy content is less. Casting aluminum alloy is the liquid metal directly pouring in the sand mold, made of various shapes of complex parts, for this kind of alloy requirements have good casting, that is, good fluidity, alloy content is small, suitable for deformation aluminum alloy, alloy content is long, do casting aluminum alloy. Aluminum alloy elastic modulus is small, only equivalent to 1/3 of steel, that is, under the same section, to the same load, aluminum alloy elastic deformation is 3 times of steel, bearing force is not strong, but good seismic performance. The hardness range of aluminum alloy (including annealing and age hardening state) is 20~120HB.

Harder aluminum alloys are softer than steel. Aluminum alloys have tensile strength limits ranging from 90Mpa(pure aluminum) to 600Mpa(superduralumin).

Compared with steel, the gap is larger. Aluminum alloys have low melting points (generally around 600℃ and steel around 1450℃). Aluminum alloy has excellent plasticity at room temperature and high temperature. It can be made into structural parts with complicated section shape, thin wall and high dimensional accuracy by extrusion method. In addition to suitable mechanical properties, aluminum alloy also has excellent corrosion resistance, heat conduction and spin properties.

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