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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 common industry name. It has a moderately low density and a moderately high heat capacity relative to other zinc alloys.

The properties of ZA-12 include three common variations. The property values on this page show ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare ZA-12 to: zinc-aluminums (top), all zinc alloys (middle), and the entire database (bottom).

Mechanical Properties

Brinell Hardness

89 to 100

Compressive (Crushing) Strength

230 to 270 MPa 33 to 39 x 103 psi

Elastic (Young's, Tensile) Modulus

85 GPa 12 x 106 psi

Elongation at Break

1.6 to 5.3 %

Fatigue Strength

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

Poisson's Ratio

0.26

Rockwell B Hardness

56 to 63

Shear Modulus

34 GPa 4.9 x 106 psi

Shear Strength

240 to 300 MPa 35 to 43 x 103 psi

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

Thermal Properties

Melting Completion (Liquidus)

430 °C 810 °F

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 Expansion

24 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

28 % IACS

Electrical Conductivity: Equal Weight (Specific)

41 % IACS

Otherwise Unclassified Properties

Base Metal Price

11 % relative

Density

6.1 g/cm3 380 lb/ft3

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

4.0 to 20 MJ/m3

Resilience: Unit (Modulus of Resilience)

250 to 600 kJ/m3

Stiffness to Weight: Axial

7.7 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

12 to 18 points

Strength to Weight: Bending

15 to 20 points

Thermal Diffusivity

42 m2/s

Thermal Shock Resistance

9.1 to 14 points

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

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