# Zamak 3 (ASTM AG40A, Z33520, Mazak 3) Zinc Alloy

Zamak 3 is a zinc-aluminum alloy. It is typically furnished in the as-fabricated (no temper or treatment) condition. AG40A is the ASTM designation for this material. Z33520 is the UNS number. And Zamak 3 is the common industry name. It has the lowest fracture toughness relative to other zinc alloys in the database. The graph bars on the material properties cards below compare Zamak 3 to: zinc-aluminums (top), all zinc alloys (middle), and the entire database (bottom).

## Mechanical Properties

Brinell Hardness

83

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

11 *%*

Fatigue Strength

48 *MPa* 6.9 *x 10 ^{3} psi*

Fracture Toughness

12 *MPa-m ^{1/2}* 11190

*psi-in*

^{1/2}Knoop Hardness

110

Poisson's Ratio

0.25

Resilience: Ultimate (Unit Rupture Work)

28 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

260 *kJ/m ^{3}*

Rockwell B Hardness

50

Shear Modulus

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

Shear Strength

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

Strength to Weight Ratio

44 *kN-m/kg*

Tensile Strength: Ultimate (UTS)

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

Tensile Strength: Yield (Proof)

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

43 *m ^{2}/s*

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*

## Alloy Composition

Zn | 95.3 to 96.5 | |

Al | 3.5 to 4.3 | |

Cu | 0 to 0.25 | |

Fe | 0 to 0.1 | |

Mg | 0.020 to 0.060 | |

Si | 0 to 0.030 | |

Ni | 0 to 0.020 | |

Pb | 0 to 0.0050 | |

Cd | 0 to 0.0050 | |

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