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Zinc-Aluminum 12 (ZA-12, Z35631)

ZA-12 is a zinc-aluminum alloy. Z35631 is the UNS number for this material. ZA-12 is the industry name. It has a moderately low density and a moderately high heat capacity relative to other zinc alloys. It has three common variants, each represented as a separate material. The material properties section shows ranges encompassing all variants. To see the details of each variant on a separate page, follow the links in the Variant Materials section further below.

Mechanical Properties

Graph bars compare ZA-12 to other materials. From top to bottom: zinc-aluminum, zinc alloys, and the entire database.

Brinell Hardness

89 to 100

Compressive (Crushing) Strength

230 to 270 MPa 33 to 39 x 103 psi

Elastic (Young's, Tensile) Modulus

83 GPa 12 x 106 psi

Elongation at Break

1.6 to 5.3 %

Fatigue Strength (Endurance Limit)

73 to 120 MPa 11 to 17 x 103 psi

Fracture Toughness

14 to 15 MPa-m1/2 12980 to 13350 psi-in1/2

Knoop Hardness

110 to 130

Modulus of Resilience (Unit Resilience)

260 to 620 kJ/m3

Poisson's Ratio

0.26

Rockwell B Hardness

56 to 63

Shear Modulus

32 GPa 4.6 x 106 psi

Shear Strength

240 to 300 MPa 35 to 43 x 103 psi

Strength to Weight Ratio

39 to 61 kN-m/kg

Tensile Strength: Ultimate (UTS)

260 to 400 MPa 38 to 59 x 103 psi

Tensile Strength: Yield (Proof)

210 to 320 MPa 30 to 46 x 103 psi

Unit Rupture Work (Ultimate Resilience)

4.0 to 20 MJ/m3

Thermal Properties

Melting Onset (Solidus)

380 °C 710 °F

Solidification (Pattern Maker's) Shrinkage

1.3 %

Specific Heat Capacity

450 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

120 W/m-K 67 BTU/h-ft-°F

Thermal Diffusivity

39 m2/s

Thermal Expansion

24 µm/m-K

Other Material Properties

Base Metal Price

19 % relative

Density

6.7 g/cm3 420 lb/ft3

Electrical Conductivity: Equal Volume

28 % IACS

Electrical Conductivity: Equal Weight (Specific)

38 % IACS

Electrical Resistivity Order of Magnitude

-7.0 10x Ω-m

Embodied Carbon

3.4 kg CO2/kg material

Embodied Energy

64 MJ/kg 28 x 103 BTU/lb

Embodied Water

440 L/kg 52 gal/lb

Alloy Composition

Zinc (Zn) 87.1 to 89
Aluminum (Al) 10.5 to 11.5
Copper (Cu) 0.5 to 1.2
Iron (Fe) 0 to 0.075
Silicon (Si) 0 to 0.060
Magnesium (Mg) 0.015 to 0.030
Nickel (Ni) 0 to 0.020
Lead (Pb) 0 to 0.0060
Cadmium (Cd) 0 to 0.0060
Tin (Sn) 0 to 0.0030

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Variant Materials

Similar Alloys

Further Reading

ASTM B86: Standard Specification for Zinc and Zinc-Aluminum (ZA) Alloy Foundry and Die Castings

EN 12844: Zinc and zinc alloys - Castings - Specifications

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993