Question

Mixing magnesium and aluminum together produces an excellent lightweight material from which to make airplane parts what is this type of mixture called

Answer 1

Mixing magnesium and aluminum together produces an excellent lightweight material from which to make airplane parts. This type of mixture is called an alloy. 
Alloy is a mixture of two elements, one of which is a metal. 

Answer 2

Answer: This type of mixture is called as homogeneous mixture

Explanation:

When two or more than two metals are mixed together to form a new metallic substance it is called an Alloy. It is a homogeneous solid mixture of the metals. Mixing of two metals together enhances the property of the new substance in terms resistance to corrosion, greater strength etc.

Lightweight material formed by the mixing of magnesium and aluminium  used to make parts of airplane is an example of an alloy.