Zinc-Aluminum Alloys – ZA12

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Other Designations


Zinc-aluminum (ZA) alloys are alloys with zinc as the base metal having higher concentrations of aluminum than traditional zinc alloys. Apart from aluminum, copper and magnesium are also alloyed with zinc. The ZA alloys were first introduced for gravity casting.

Zinc aluminum alloys are high performance alloys that exhibit good strength and hardness. They also show good wear resistant properties when compared to zinc or aluminum alloys. Some of the common zinc-aluminum alloys are ZA8, ZA12 and ZA27, the number in the alloy name represents the concentration of aluminum in the alloy (e.g., ZA27 means the aluminum percentage is 27).

ZA12 alloy is suited for permanent mold applications. It exhibits good strength, hardness, creep properties and dimensional stability. This datasheet will elaborate on the chemical composition and properties of ZA12 alloy.

Chemical Composition

The chemical composition of zinc-aluminum ZA12 alloy is given in the following table.

Element Content (%)
Zinc,Zn Remainder
Aluminum,Al 11.5
Copper, Cu 1.2
Iron, Fe 0.075
Magnesium, Mn 0.03
Lead, Pb 0.006
Cadmium, Cd 0.006
Tin, Sn 0.003

Physical Properties

The following table discusses the physical properties of zinc-aluminum ZA12 alloy.

Properties Metric Imperial
Density 6 gm/cm3 0.218 lb/in3

Mechanical Properties

The mechanical properties of zinc-aluminum ZA12 alloy are tabulated below.

Properties Metric Imperial
Tensile strength 276-317 MPa 40-46 ksi
Yield strength 214 MPa 31 ksi
Modulus of elasticity 82.7 GPa 12070 ksi
Poisson’s ratio 0.3 0.3

Other Designations

Some of the other designations that are used to denote zinc-aluminum ZA12 alloy are as below:

  • AG40A
  • Z35631.


The zinc-aluminum ZA12 alloy is used in the following applications:

  • Bearings
  • Permanent mold
  • Thin wall decorations.


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