Tools for different requirements of aluminum alloy properties, has developed a variety of cast aluminum alloys, mainly: ordinary cast aluminum alloy, high-strength cast aluminum alloy, strong heat cast aluminum alloy, corrosion-resistant cast aluminum alloy. According to the different elements, the alloy series are: aluminum-silicon alloy, aluminum-tin alloy, etc. As for other series of cast aluminum alloys, most of them are improved products of the above basic alloy series.
Aluminium-silicon-based cast aluminum alloys are commonly known as “silicon-aluminum alloys”. The content of silicon is relatively wide, usually 5%-25%, and elements such as magnesium and barrels are added to form eutectic alloys, hypoeutectic alloys or hyper-common alloy,. The eutectic alloy in the aluminum-silicon alloy has a small density and good mechanical properties.
The alloy with 5% silicon content is a simple AI-SI binary alloy with poor mechanical properties and machinability. It is limited in use, and only the production shape is only used for small non-bearing parts on the back wall or used as solder.
An alloy with a silicon content of more than 5%-13%, which belongs to a hypoeutectic alloy, has good casting process performance, good air tightness, but low strength and cannot be heat treated, in order to further provide the strength of the aluminum silicon alloy, Add copper and magnesium. After that, the strength is high and it can be heat strengthened.
Guo eutectic alloy with silicon content greater than 13% has the characteristics of small thermal expansion coefficient and good corrosion resistance.
For alloys with higher silicon content, if good strength and toughness are required, the modification can be used to obtain a significant improvement. Adding proper amount of NA and SR can refine the eutectic silicon and effectively deteriorate the alloy. . The modification treatment has obvious influence on the sand castings, and the influence on the performance of the metal castings is also favorable.
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