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In the aluminum alloy each element to the aluminum alloy performance influence | rises the knowledge!

Views:5     Author:Site Editor     Publish Time: 2019-06-03      Origin:Site

Aluminum alloy has different properties because of adding different metal elements. Among the metal elements, the elements that have a greater impact on the performance of aluminum alloy are copper (Cu), magnesium (Mg), silicon (Si), iron (Fe), manganese (Mn), nickel (Ni), zinc (Zn), and so on.

Aluminum alloy

Copper (Cu)


Solution strengthening and aging strengthening effect, the best strengthening effect is when the copper content is between 4% and 6.8%, so the copper content of most hard aluminum alloy is in this range. Increase the content of copper, improve the fluidity, tensile strength and hardness of the alloy, improve the mechanical properties, and improve the machinability.


Reducing corrosion resistance and shaping, increasing the tendency of thermal cracking.

Magnesium (Mg)


Increase tensile strength and yield limit, improve the machinability of alloy.


Mg2Si will make the casting brittle.

Silicon (Si)


Improve casting performance of alloy. Silicon and aluminum can form a solid solution, which can improve the high temperature modeling of the alloy, reduce shrinkage, and no hot cracking tendency. Improve tensile strength, hardness, machinability and strength at high temperature, and reduce elongation.


The crystallized silicon (Si) is prone to the hard point of free silicon, which makes the cutting property worse.

Iron (Fe)


Aluminum alloy adhesion to the mold is very strong, especially when the iron content is less than 0.6%, that is, it is not easy to release the mold phenomenon. When the iron content exceeds 0.6%, the adhesion phenomenon is greatly reduced.


When the amount of iron in aluminum alloy is too high, the flake or needle structure of FeAl3, Fe2Al7 and al-si-fe exist in the alloy, forming metal compounds and forming hard spots. This kind of structure will also reduce the mechanical properties, increase the thermal cracking, and make the casting brittle. Moreover, when the amount of iron (Fe) exceeds 1.2%, the alloy fluidity is reduced, the quality of casting is damaged, and the life of metal components in die casting equipment is shortened.

Manganese (Mn)


The strength of the alloy increases with increasing solubility. The elongation reached its maximum when the manganese content was 0.8%. Manganese (Mn) can prevent the recrystallization process, increase the recrystallization temperature, and significantly refine the recrystallization grains. The refinement of recrystallized grains is mainly due to the effect of diffusion particle of MnAl6 compound on the growth of recrystallized grains. Another function of MnAl6 is to dissolve the impurity iron (Fe) and form (Fe, Mn) Al6, which changes the flake or needle structure formed by iron into fine crystal structure in aluminum alloy and reduces the harmful effect of iron.


High manganese content causes segregation.

Nickel (Ni)


It has a tendency to increase tensile strength and hardness, which has a great influence on corrosion resistance.


Reduce corrosion resistance and thermal conductivity.

Zinc (zinc)


Zinc and magnesium are added to aluminum to form Mg/Zn2, which can significantly strengthen the alloy.


There is a tendency to stress corrosion cracking.

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