As we all know, pure metal is little used in daily life for being soft, so is aluminum. But looking around, from the window frame to ceilings to kettles, they are all made of aluminum alloy. Actually, aluminum alloy has been divided into seven series with different features and application.
The series one is generally cheap and used in normal industries. The two and seven are mainly used for aviation with high rigidity. The four, added with silicon, can melt in low temperature and thus is applied as welding materials. With silicon and magnesium, the six is the source of forging in cold. The three and the five in China have been developed, therefore the former is stainless and the latter is used in many fields with low density and high extending rate.
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