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How comes the characteristic of aluminum alloy?

Views:3     Author:Jia Hua Aluminium Co., Ltd     Publish Time: 2019-11-30      Origin:Site

How comes the characteristic of aluminum alloy?

What’s the chemical element of the aluminum alloy? As we know that the purity aluminum is not strong enough for daily use. Therefore, it will be made into the aluminum alloy which is stronger than the purity aluminum. Aluminum alloy has low density but high strength. It is close to or exceeds high quality steel. It has good plasticity and can be processed into various profiles. It has excellent electrical conductivity, thermal conductivity and corrosion resistance. How comes the characteristic of aluminum alloy? This is due to the alloying elements of the aluminum alloy.


Aluminum alloy profiles


COOPER

 

The maxi solubility of cooper in aluminum is 5.65% when aluminum in aluminum cooper alloy is 548. If the temperature down to 302, the solubility of cooper is 0.45%. Cooper is an important alloy element which have the solid solution strengthening effect. In addition, CuAl2 precipitated with aging has obvious aging strengthening effect. The copper content of aluminum alloy is usually 2.5% ~ 5%, and the strengthening effect is best when the copper content is 4% to 6.8%, so the copper content of most hard aluminum alloys is in this range.


Silicon

  

At the eutectic temperature of 577, the maximum solubility of silicon in the solid solution of rhenium is 1.65%. Although solubility decreases with decreasing temperature, these alloys are generally not heat strengthened. Al-Si alloy has excellent castability and corrosion resistance.

 

In the deformed aluminum alloy, the addition of silicon to aluminum alone is limited to welding materials, and the addition of silicon to aluminum has a certain strengthening effect.


Magnesium

 

Al-Mg alloy equilibrium phase diagram Al-rich part Although the solubility curve shows that the solubility of magnesium in aluminum decreases greatly with temperature, the content of magnesium in most industrial deformed aluminum alloys is less than 6%. The silicon content is also low. This type of alloy cannot be strengthened by heat treatment, but has good welding and corrosion resistance, and has elemental analysis of medium strength aluminum alloys.

Magnesium strengthens aluminum obviously. With each increase of 1% magnesium, the tensile strength increases by about 34MPa.

 

Manganese

 

At the eutectic temperature of 658, the flat equilibrium phase diagram of Al-Mn alloy system has a maximum solubility of 1.82% in the solid solution of manganese. The strength of the alloy increases with increasing solubility. When the manganese content is 0.8%, the elongation reaches a maximum. Al-Mn alloy is a non-aging hardening alloy, that is, it cannot be strengthened by heat treatment.

  

Zinc

 

Rhenium zinc is added to aluminum alone, and the improvement of aluminum alloy strength under deformation conditions is very limited. At the same time, there is a stress corrosion cracking and tendency, which limits its application.

 

When zinc and magnesium are added to aluminum at the same time, a strengthening phase Mg / Zn2 is formed, which has a significant strengthening effect on the alloy. When the content of Mg / Zn2 is increased from 0.5% to 12%, the tensile strength and yield strength can be significantly increased. When the content of magnesium exceeds the superhard aluminum alloy required to form the Mg / Zn2 phase, the stress corrosion cracking resistance is the maximum when the ratio of zinc to magnesium is controlled at about 2.7.


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