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Aluminum alloy die castings refer to pure aluminum or aluminum alloy equipment and devices obtained by casting. Generally, aluminum or aluminum alloy heated to liquid is poured into the mold cavity by sand mold or metal mold, and the aluminum parts or aluminum alloy parts of various shapes and sizes are usually called aluminum die castings. However, different aluminum alloy die casting will produce different types and effects.
The performance characteristics of aluminum alloy die castings are: good mechanical properties at room temperature; Strong corrosion resistance; The casting properties are poor, and the fluctuation of mechanical properties and wall thickness effect are large; When used for a long time, the plasticity of the alloy decreases due to aging, and even the die castings crack; The tendency of stress corrosion cracking of die castings is also large. The disadvantages of Al Mg alloy partially offset its advantages and limited its application.
After natural aging, aluminum alloy die castings can obtain high mechanical properties. When the mass fraction of zinc is greater than 10%, the strength is significantly improved. The disadvantage of this alloy is poor corrosion resistance, tendency to stress corrosion and easy to hot crack during die casting. The commonly used y401 alloy has good fluidity and is easy to fill the cavity. The disadvantage is that it has a large tendency to form pores and is easy to hot crack when the content of silicon and iron is small.
Aluminum alloy has the characteristics of crystallization temperature interval, large solidification latent heat, large specific heat capacity and small linear shrinkage coefficient of silicon phase in alloy. Therefore, its casting performance is generally better than other aluminum alloys, its mold filling ability is also better, and its hot crack and shrinkage porosity tendency are relatively small. The amount of brittle phase (silicon phase) in Al Si eutectic is the least, and the mass fraction is only about 10%, so its plasticity is better than that of other aluminum alloys. The only brittle phase can be further improved by modification.
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