# Permanent Mold Cast Zinc-Aluminum 8

Permanent mold ZA-8 is ZA-8 in the as-fabricated (no temper or treatment) condition. The graph bars on the material properties cards below compare permanent mold ZA-8 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

87

Compressive (Crushing) Strength

210 *MPa* 30 *x 10 ^{3} psi*

Elastic (Young's, Tensile) Modulus

85 *GPa* 12 *x 10 ^{6} psi*

Elongation at Break

1.3 *%*

Fatigue Strength

51 *MPa* 7.4 *x 10 ^{3} psi*

Fracture Toughness

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

*x 10*

^{3}psi-in^{1/2}Knoop Hardness

110

Poisson's Ratio

0.26

Rockwell B Hardness

54

Shear Modulus

34 *GPa* 4.9 *x 10 ^{6} psi*

Shear Strength

240 *MPa* 35 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

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

Tensile Strength: Yield (Proof)

210 *MPa* 30 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

110 *J/g*

Maximum Temperature: Mechanical

100 *°C* 210 *°F*

Melting Completion (Liquidus)

400 *°C* 760 *°F*

Melting Onset (Solidus)

380 *°C* 710 *°F*

Solidification (Pattern Maker's) Shrinkage

1.1 *%*

Specific Heat Capacity

440 *J/kg-K* 0.1 *BTU/lb-°F*

Thermal Conductivity

120 *W/m-K* 66 *BTU/h-ft-°F*

Thermal Expansion

23 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

28 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

40 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

11 *% relative*

Density

6.3 *g/cm ^{3}* 390

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

62 *MJ/kg* 26 *x 10 ^{3} BTU/lb*

Embodied Water

420 *L/kg* 50 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

2.8 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

260 *kJ/m ^{3}*

Stiffness to Weight: Axial

7.5 *points*

Stiffness to Weight: Bending

23 *points*

Strength to Weight: Axial

9.3 *points*

Strength to Weight: Bending

12 *points*

Thermal Diffusivity

42 *mm ^{2}/s*

Thermal Shock Resistance

7.6 *points*

## Alloy Composition

Zn | 89.7 to 91.2 | |

Al | 8.0 to 8.8 | |

Cu | 0.8 to 1.3 | |

Fe | 0 to 0.075 | |

Si | 0 to 0.045 | |

Mg | 0.015 to 0.030 | |

Ni | 0 to 0.020 | |

Pb | 0 to 0.0060 | |

Cd | 0 to 0.0060 | |

Sn | 0 to 0.0030 |

All values are % weight. Ranges represent what is permitted under applicable standards.

## Followup Questions

## 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

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

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