The influence of the main elements of aluminum alloy on the properties of various aluminum alloys


1000 series-pure aluminum with more than 99% aluminum c […]

1000 series-pure aluminum with more than 99% aluminum content, mainly used in electrical or chemical fields. This series of aluminum has excellent corrosion resistance, high thermal conductivity, high electrical conductivity, low mechanical properties, and excellent plasticity.

2000 series-copper is the main alloy element of this series. This series of alloys needs to be solution heat treated to obtain the best performance. The mechanical properties of the heat treated state are similar to mild steel. It can also be artificially aged to further improve its mechanical properties, that is, to improve the material The yield strength, but the elongation will be reduced, this series of alloys have poor corrosion resistance, so this series of alloys often need to be coated with a layer of high-purity aluminum, which greatly improves corrosion resistance.

3000 series-Manganese is the main metal element in this series, and it is generally a non-heat treatable alloy. Because the addition of manganese is limited (less than 1.5%), the manganese alloy has good plasticity and medium strength.

4000 series-silicon is the main alloy element in this series. Adding sufficient silicon can reduce the melting point without causing brittleness in the final alloy. Al-Si alloy is mainly used as a welding electrode. Most of this series of alloys cannot be heat-treated and strengthened, but the welding melt At this time, some alloys containing absorbed welded parts should be heat-treated in a limited amount, and the amount of alloys containing a large amount of silicon becomes dark gray during anodizing.

5000 series-Magnesium is the most widely added alloy in the alloy. When magnesium is the main addition alloy, it can obtain a medium-strength or high-strength non-heat treatable alloy. As a hardener, magnesium is more effective than manganese. 0.8% magnesium is equivalent to 1.25 % Manganese, this series of alloys has good weldability and corrosion resistance to the marine atmosphere. In order to ensure corrosion resistance, the cold working temperature and cold working amount should be controlled within a certain range.

6000 series-this series of alloys contains a magnesium-silicon (Mg2:Si) ratio similar to that of magnesium silicide (Mg2:Si). It is heat-treated and can strengthen the alloy. It has medium strength, good formability and corrosion resistance. Representative alloys are 6063 and 6061. , Widely used in industrial production.

7000 series-Zinc is the main alloy element in this series. A small amount of magnesium is added to form a superhard alloy that can be strengthened by heat treatment. This series of alloys can be divided into copper-containing and copper-free types: copper-free Al- The main features of Zn-Mg are excellent welding performance, suitable for large workpieces that do not require heat treatment after welding; copper-containing alloys are beneficial to increase strength, but will reduce stress resistance and corrosion resistance.

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