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

Zamak 7 is a zinc-aluminum alloy. Cited properties are appropriate for 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). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

## Mechanical Properties

Brinell Hardness

80

Compressive (Crushing) Strength

410 *MPa* 60 *x 10 ^{3} psi*

Elastic (Young's, Tensile) Modulus

86 *GPa* 13 *x 10 ^{6} psi*

Elongation at Break

13 *%*

Fatigue Strength

47 *MPa* 6.8 *x 10 ^{3} psi*

Knoop Hardness

99

Poisson's Ratio

0.25

Shear Modulus

33 *GPa* 4.8 *x 10 ^{6} psi*

Shear Strength

210 *MPa* 31 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

280 *MPa* 41 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

250 *MPa* 37 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

120 *J/g*

Maximum Temperature: Mechanical

95 *°C* 200 *°F*

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/cm ^{3}* 400

*lb/ft*

^{3}Embodied Carbon

3.0 *kg CO _{2}/kg material*

Embodied Energy

57 *MJ/kg* 25 *x 10 ^{3} BTU/lb*

Embodied Water

380 *L/kg* 45 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

36 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

370 *kJ/m ^{3}*

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 *mm ^{2}/s*

Thermal Shock Resistance

8.6 *points*

## Alloy Composition

Zn | 95.3 to 96.5 | |

Al | 3.5 to 4.3 | |

Cu | 0 to 0.25 | |

Fe | 0 to 0.075 | |

Ni | 0.0050 to 0.020 | |

Mg | 0.0050 to 0.020 | |

Pb | 0 to 0.0030 | |

Cd | 0 to 0.0020 | |

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

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

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

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