Copper-Magnesium (CuMg) Master Alloy

Topics Covered

Chemical Composition


Master alloys are semi-finished products, and can be formed in different shapes. They are defined as a pre-alloyed mixture of alloying elements. They are also known as modifiers, hardeners, or grain refiners. They are added to a melt to achieve a desired result. They are used instead of a pure metal because they are very economical.

The following datasheet discusses copper-magnesium master alloy in more detail.

Chemical Composition

The following table shows the chemical composition of copper-magnesium master alloy.

Element Content (%)
Copper, Cu 89-91
Magnesium, Mg 9-11
Silicon, Si 0.15
Manganese, Mn 0.1
Zinc, Zn 0.1
Nickel, Ni 0.1
Tin, Sn 0.05
Phosphorous, P 0.05
Lead, Pb 0.05
Iron, Fe 0.02
Arsenic, As 0.01


Copper-magnesium master alloy is used as a nodularizer in ductile SG iron. It can be also used for improving mechanical properties of low alloyed copper, and alloying magnesium into low alloyed wrought copper-magnesium alloys.

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