Why should the computer case use aluminum alloy?

Your question should start with the characteristics of aluminum alloy:

Aluminum alloy is made of pure aluminum and some alloying elements, such as aluminum-copper alloy, aluminum-zinc-magnesium-copper superhard aluminum alloy and so on.

Aluminum alloy has the characteristics of light weight, low cost, mechanical (uniform stress), easy processing and high heat dissipation. In particular, automotive engine components are particularly suitable for using aluminum alloy materials.

As for computer cases, most of them are made of aluminum-copper alloy. The main consideration is heat dissipation. Because copper and aluminum are mixed and extruded, the heat dissipation performance is quite good, and even some high-end CPU water-cooled fans use this material. If it is military, the first choice is to ensure firmness, and the first choice is aluminum-zinc-magnesium-copper superhard aluminum alloy.

As for whether aluminum alloy can prevent electromagnetic radiation, the answer is no, not to mention the electromagnetic radiation caused by computer operation. As far as the characteristics of the alloy itself are concerned, its radiation is very small (it does not harm the body). Lead is necessary to completely shield from radiation. Because the density of lead is particularly high, it can prevent radiation particles from penetrating itself. However, it is impossible to mix lead and aluminum as chassis materials. The hardness of aluminum is lower in normal state, and lead is lower than aluminum, so it can't be used as a chassis after synthesis.

I hope my answer can help you!