Zinc-Aluminum 12 (ZA-12, Z35631)

ZA-12 is an alloy of zinc, further classified as a zinc-aluminum. Z35631 is the UNS number for this material. ZA-12 is the industry name.

It has three common variants, each represented as a separate material.

Material Properties

Base Metal Price19 % rel

Compressive (Crushing) Strength230 to 270 MPa (33 to 39 x 103 psi)

Density6.0 g/cm3 (370 lb/ft3)

Elastic (Young's, Tensile) Modulus83 GPa (12 x 106 psi)

Electrical Conductivity28 % IACS

Electrical Resistivity Order of Magnitude-7 10x Ω-m

Elongation at Break1.6 to 5.3 %

Fatigue Strength (Endurance Limit)73 to 120 MPa (11 to 17 x 103 psi)

Fracture Toughness14 to 15 MPa-m1/2

Knoop Hardness110 to 130

Melting Onset (Solidus)380 °C (720 °F)

Poisson's Ratio0.26

Rockwell B Hardness56 to 63

Shear Modulus32 GPa (4.6 x 106 psi)

Shear Strength240 to 300 MPa (35 to 44 x 103 psi)

Solidification (Pattern Maker's) Shrinkage1.3 %

Specific Heat Capacity450 J/kg-K

Strength to Weight Ratio43 to 67 kN-m/kg

Tensile Strength: Ultimate (UTS)260 to 400 MPa (38 to 58 x 103 psi)

Tensile Strength: Yield (Proof)210 to 320 MPa (30 to 46 x 103 psi)

Thermal Conductivity120 W/m-K

Thermal Diffusivity44

Thermal Expansion24 µm/m-K

Alloy Composition

Zinc (Zn)87.2 to 89 %

Aluminum (Al)10.5 to 11.5 %

Copper (Cu)0.5 to 1.2 %

Iron (Fe)0 to 0.075 %

Magnesium (Mg)0.015 to 0.030 %

Lead (Pb)0 to 0.0060 %

Cadmium (Cd)0 to 0.0060 %

Tin (Sn)0 to 0.0030 %

Further Reading

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

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

MakeItFrom.com