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Zamak 7 (ASTM AG40B, Z33523, Mazak 7) Zinc Alloy

Zamak 7 is a zinc-aluminum alloy. It is typically furnished in the as-fabricated (no temper or treatment) condition. AG40B is the ASTM designation for this material. Z33523 is the UNS number. And Zamak 7 is the common industry name. The graph bars on the material properties cards below compare Zamak 7 to: zinc-aluminums (top), all zinc alloys (middle), and the entire database (bottom).

Mechanical Properties

Brinell Hardness

80

Compressive (Crushing) Strength

410 MPa 60 x 103 psi

Elastic (Young's, Tensile) Modulus

86 GPa 13 x 106 psi

Elongation at Break

13 %

Fatigue Strength

47 MPa 6.8 x 103 psi

Knoop Hardness

99

Poisson's Ratio

0.25

Shear Modulus

33 GPa 4.8 x 106 psi

Shear Strength

210 MPa 31 x 103 psi

Tensile Strength: Ultimate (UTS)

280 MPa 41 x 103 psi

Tensile Strength: Yield (Proof)

250 MPa 37 x 103 psi

Thermal Properties

Melting Completion (Liquidus)

390 °C 730 °F

Melting Onset (Solidus)

380 °C 720 °F

Solidification (Pattern Maker's) Shrinkage

1.2 %

Specific Heat Capacity

410 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

110 W/m-K 65 BTU/h-ft-°F

Thermal Expansion

27 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

27 % IACS

Electrical Conductivity: Equal Weight (Specific)

38 % IACS

Otherwise Unclassified Properties

Base Metal Price

11 % relative

Density

6.4 g/cm3 400 lb/ft3

Embodied Carbon

3.0 kg CO2/kg material

Embodied Energy

57 MJ/kg 25 x 103 BTU/lb

Embodied Water

380 L/kg 45 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

36 MJ/m3

Resilience: Unit (Modulus of Resilience)

370 kJ/m3

Stiffness to Weight: Axial

7.5 points

Stiffness to Weight: Bending

23 points

Strength to Weight: Axial

12 points

Strength to Weight: Bending

15 points

Thermal Diffusivity

43 m2/s

Thermal Shock Resistance

8.6 points

Alloy Composition

Zinc (Zn) 95.3 to 96.5
Aluminum (Al) 3.5 to 4.3
Copper (Cu) 0 to 0.25
Iron (Fe) 0 to 0.075
Nickel (Ni) 0.0050 to 0.020
Magnesium (Mg) 0.0050 to 0.020
Lead (Pb) 0 to 0.0030
Cadmium (Cd) 0 to 0.0020
Tin (Sn) 0 to 0.0010

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

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