The aluminum alloy airtight joint casting processing can directly obtain the aluminum alloy of a part. Usually in this case, the content of such alloying elements is generally more than that of the deformed aluminum alloy. So what is the specific situation of the classification of aluminum alloy airtight joint casting processing?

　　The main research contents are as follows:

　　1. Al-Si alloy, also known as "Si-Al" or "Si-Al". In the aluminum alloy airtight joint casting processing, the casting performance and wear resistance are good, the thermal expansion coefficient is small, and the types and amounts of alloys are large, and the silicon content is 4% to 13%.

　　2. Aluminum-copper alloy and 4.5%~5.3% copper alloy have good strengthening effect. Appropriate addition of manganese and titanium can improve room temperature, high temperature strength and casting performance.

　　3. Aluminum-magnesium alloy, cast aluminum alloy with low density and high strength, containing 12% magnesium, with good strengthening effect.

　　4. Aluminum-zinc alloys are often added with silicon and magnesium elements in order to improve the working performance, which are often called "zinc-silicon-aluminum-ming". Under the conditions of casting technology, the alloy has the main function of quenching, that is, "quenching by itself".

　　In addition to strain strengthening, the aluminum alloy airtight joint casting processing has the same alloy system and the same strengthening mechanism as deformed aluminum alloys. The main difference in the casting process of aluminum alloy hermetic joints is that the large content of alloying element silicon in cast aluminum alloys exceeds that in most wrought aluminum alloys.