# Zamak 5 (ASTM AC41A, Z35531, Mazak 5) Zinc Alloy

Zamak 5 is a zinc-aluminum alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. AC41A is the ASTM designation for this material. Z35531 is the UNS number. And Zamak 5 is the common industry name.

It has a very low electrical conductivity and a moderately high tensile strength among zinc alloys.

The graph bars on the material properties cards below compare Zamak 5 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

92

Compressive (Crushing) Strength

600 *MPa* 87 *x 10 ^{3} psi*

Elastic (Young's, Tensile) Modulus

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

Elongation at Break

6.3 *%*

Fatigue Strength

56 *MPa* 8.2 *x 10 ^{3} psi*

Knoop Hardness

120

Poisson's Ratio

0.25

Rockwell B Hardness

57

Shear Modulus

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

Shear Strength

260 *MPa* 38 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

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

Tensile Strength: Yield (Proof)

240 *MPa* 35 *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* 64 *BTU/h-ft-°F*

Thermal Expansion

27 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

26 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

37 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

12 *% 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)

19 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

330 *kJ/m ^{3}*

Stiffness to Weight: Axial

7.5 *points*

Stiffness to Weight: Bending

23 *points*

Strength to Weight: Axial

14 *points*

Strength to Weight: Bending

16 *points*

Thermal Diffusivity

42 *m ^{2}/s*

Thermal Shock Resistance

9.9 *points*

## Alloy Composition

Zn | 94.3 to 95.7 | |

Al | 3.5 to 4.3 | |

Cu | 0.7 to 1.3 | |

Mg | 0.025 to 0.080 | |

Fe | 0 to 0.1 | |

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

EN 12844: Zinc and zinc alloys - Castings - Specifications

Corrosion and Electrochemistry of Zinc, Xiaoge Gregory Zhang, 1996

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