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Zinc-Aluminum 27 (ZA-27, Z35841)

ZA-27 is a zinc-aluminum alloy. Z35841 is the UNS number for this material. ZA-27 is the common industry name. It has a fairly low density among zinc alloys. In addition, it has a fairly high heat capacity and can have a fairly high tensile strength.

The properties of ZA-27 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-27 to: zinc-aluminums (top), all zinc alloys (middle), and the entire database (bottom).

Mechanical Properties

Brinell Hardness

100 to 120

Compressive (Crushing) Strength

260 to 370 MPa 37 to 54 x 103 psi

Elastic (Young's, Tensile) Modulus

83 GPa 12 x 106 psi

Elongation at Break

2.0 to 4.5 %

Fatigue Strength

110 to 170 MPa 16 to 25 x 103 psi

Fracture Toughness

20 to 24 MPa-m1/2 18200 to 21660 psi-in1/2

Knoop Hardness

120 to 140

Poisson's Ratio

0.27

Rockwell B Hardness

60 to 72

Shear Modulus

32 GPa 4.7 x 106 psi

Shear Strength

230 to 330 MPa 33 to 47 x 103 psi

Tensile Strength: Ultimate (UTS)

400 to 430 MPa 58 to 62 x 103 psi

Tensile Strength: Yield (Proof)

260 to 370 MPa 37 to 54 x 103 psi

Thermal Properties

Melting Completion (Liquidus)

480 °C 900 °F

Melting Onset (Solidus)

380 °C 710 °F

Solidification (Pattern Maker's) Shrinkage

1.3 %

Specific Heat Capacity

530 J/kg-K 0.13 BTU/lb-°F

Thermal Conductivity

130 W/m-K 72 BTU/h-ft-°F

Thermal Expansion

26 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

30 % IACS

Electrical Conductivity: Equal Weight (Specific)

48 % IACS

Otherwise Unclassified Properties

Base Metal Price

11 % relative

Density

5.6 g/cm3 350 lb/ft3

Embodied Carbon

4.2 kg CO2/kg material

Embodied Energy

80 MJ/kg 34 x 103 BTU/lb

Embodied Water

570 L/kg 68 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

8.1 to 18 MJ/m3

Resilience: Unit (Modulus of Resilience)

400 to 840 kJ/m3

Stiffness to Weight: Axial

8.2 points

Stiffness to Weight: Bending

26 points

Strength to Weight: Axial

20 to 21 points

Strength to Weight: Bending

22 to 23 points

Thermal Diffusivity

43 m2/s

Thermal Shock Resistance

13 to 14 points

Alloy Composition

Zinc (Zn) 69.3 to 73
Aluminum (Al) 25 to 28
Copper (Cu) 2.0 to 2.5
Iron (Fe) 0 to 0.1
Silicon (Si) 0 to 0.080
Magnesium (Mg) 0.010 to 0.020
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

EN 12844: Zinc and zinc alloys - Castings - Specifications

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

Corrosion Resistance of Zinc and Zinc Alloys, Frank C. Porter, 1994

Zinc Handbook: Properties, Processing, and Use In Design, Frank C. Porter, 1991

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015

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