Magnesium-aluminum alloy is an alloy in which magnesium is added to aluminum alloy, and the numbering sequence of 5xxx is obtained in aluminum alloy numbering. The advantage of magnesium-aluminum alloy is that its strength and hardness are equivalent to those of steel, but its weight is much lighter than that of steel and close to that of plastic.

Therefore, because of its light weight and good thermal conductivity, it is often used in electronic devices that need to pay attention to heat dissipation. It is widely used in portable computers.