Difference Between Aluminum Die Casting and Aluminum Alloy Die Casting

Aluminum is a very light metal with a density of 2.7 g/cm³. Aluminum has good thermal conductivity and conductivity. When the section and length of aluminum are the same as that of copper, the conductivity of aluminum is about 61% of that of copper. Aluminum has good resistance to atmospheric decay because it is easy to form a dense alumina film on its surface, which can prevent the further oxidation of internal metals. Aluminum basically does not react with concentrated nitric acid and organic acids. Industrial pure aluminum has high plasticity and is easy to withstand various molding processes, but its strength is too low. Therefore, pure aluminum can only be used as structural material after its strength is improved by cold deformation strengthening or alloying. Aluminum is a non-magnetic material with good reflection performance, which can reflect both visible light and ultraviolet light. The impurities in aluminum are silicon and iron. When the impurity content is higher, its conductivity, corrosion resistance, and plasticity are lower

If an appropriate amount of some alloy elements are added to aluminum, and then after cold processing or heat treatment, some characteristics can be greatly improved. The most commonly used alloy elements in aluminum are copper, magnesium, silicon, manganese, and zinc. Sometimes these elements are added alone or together. In addition to the above elements, sometimes trace amounts of titanium and chromium are added. According to the composition and production process characteristics of aluminum alloy, it can be divided into cast aluminum alloy and deformed aluminum alloy. Wrought aluminum alloys are usually made into plates, pipes, bars, and various profiles through hot or cold pressure processing, i.e. rolling, extrusion, and other processes. This kind of alloy requires high plasticity, so the alloy content is less. Casting aluminum alloy is to directly pour liquid metal into a sand mold to make various parts with complex shapes. This kind of alloy is required to have good castability, that is, good fluidity. When the alloy content is small, it is suitable to be used as a deformed aluminum alloy. When the alloy content is large, it is suitable to be used as cast aluminum alloy. The elastic modulus of aluminum alloy is small, which is only equivalent to 1/3 of steel, that is, under the same section and the same load, the elastic deformation of aluminum alloy is three times that of steel, the bearing capacity is not strong, but the seismic performance is good. The tensile strength of the aluminum alloy is much lower than that of steel. Aluminum alloy has a low melting point and excellent plasticity at room temperature and high temperature. It can be extruded into structural parts with extremely complex section shapes, thin wall, and high dimensional accuracy. Aluminum alloy not only has appropriate mechanical properties but also has excellent corrosion resistance, thermal conductivity, and polishing properties.

In the casting process, pure aluminum has poor fluidity, good thermal conductivity, high melting point and good oxidation resistance. Die cast aluminum has strong fluidity, high plasticity, low melting point, and easy surface treatment.