The role of each element in aluminum alloys

June 03, 2024

Introduce the roles of some main elements in aluminum alloys:

Aluminum (Al): As the basic element of aluminum alloys, aluminum has the characteristics of lightweight, good thermal conductivity and conductivity, which make aluminum alloys widely used in aviation, automotive, construction and other fields.

Copper (Cu): Copper has a good solid solution strengthening effect in aluminum alloys, which can improve the strength and hardness of aluminum alloys. At the same time, copper can also improve the cutting performance of aluminum alloys.

Silicon (Si): Silicon is one of the common alloying elements in aluminum alloys, which can improve the casting performance and wear resistance of aluminum alloys. In addition, silicon can also reduce the thermal expansion coefficient of aluminum alloys and improve their dimensional stability.

Magnesium (Mg): The strengthening effect of magnesium on aluminum is very obvious. For every 1% increase in magnesium, the tensile strength of aluminum alloy increases by about 34MPa. At the same time, magnesium can also reduce the hot cracking tendency of aluminum alloy and improve its welding performance.

Manganese (Mn): Manganese mainly plays a supplementary strengthening role in aluminum alloys, which can reduce the content of magnesium, improve the corrosion resistance and welding performance of aluminum alloys. In addition, manganese can also uniformly precipitate Mg5Al8 compounds, further improving the performance of aluminum alloys.

Zinc (Zn): Zinc is one of the commonly used alloying elements in aluminum alloys, which can improve the strength and toughness of aluminum alloys. At the same time, zinc can also improve the casting and processing properties of aluminum alloys.

Chromium (Cr): Chromium can form intermetallic compounds in aluminum alloys, hindering the nucleation and growth process of recrystallization, and has a certain strengthening effect on the alloy. In addition, chromium can improve the toughness of the alloy and reduce its sensitivity to stress corrosion cracking.

Strontium (Sr): Strontium is a surface active element that can change the behavior of intermetallic compounds. Modifying with strontium can improve the plasticity and final product quality of alloys. Adding strontium to Al Si casting alloys can also reduce the size of primary silicon particles and improve plasticity and workability.

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