aluminum silicon alloy auto parts

Aluminum wheels have gradually replaced steel wheels because of their light weight, good heat dissipation and good appearance. In the past 10 years, the global aluminum alloy automobile wheels have grown at an annual growth rate of 7.6%, and the aluminization rate of automobile wheels can reach 72% to 78%. Silicon-aluminum alloy, which has good casting properties and high comprehensive mechanical properties, is an example of the application of aluminum alloys in automobiles, and almost all new models use aluminum alloy wheels.

Aluminum alloys for automobile engines are the most lightweight, generally reducing weight by more than 30%. In addition, both the cylinder block and the cylinder head of the engine require materials with good thermal conductivity and strong corrosion resistance, and aluminum alloys are very prominent in these aspects. Therefore, various automobile manufacturers have carried out the research and development of the aluminum alloy of the engine.

Among lightweight metals, although the density of magnesium alloys is lower than that of silicon-aluminum alloys, the cost of magnesium ingots is higher, and there are many technical obstacles in the manufacturing process of parts, such as lack of high-temperature die-casting alloys and design data, poor surface treatment technology, and poor bonding level. Low-grade, so the current use in automobiles is quite limited; and although titanium alloys for aerospace have high mechanical strength, the manufacturing process is difficult and the manufacturing cost is expensive, resulting in the inability of titanium alloys to be applied to automobile production in large quantities. Aluminum alloy has good comprehensive performance in terms of cost, manufacturing technology, mechanical properties, sustainable development (the most aluminum content in the earth's crust, accounting for 8.1%), etc. Therefore, aluminum-silicon alloy is the preferred light metal material in the automotive industry now and in the future.