# Sand Cast Zinc-Aluminum 27

Sand cast ZA-27 is ZA-27 in the as-fabricated (no temper or treatment) condition. It has the highest ductility compared to the other variants of ZA-27. The graph bars on the material properties cards below compare sand cast ZA-27 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

110

Compressive (Crushing) Strength

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

Elastic (Young's, Tensile) Modulus

78 *GPa* 11 *x 10 ^{6} psi*

Elongation at Break

4.5 *%*

Fatigue Strength

170 *MPa* 25 *x 10 ^{3} psi*

Fracture Toughness

24 *MPa-m ^{1/2}* 22

*x 10*

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

140

Poisson's Ratio

0.27

Rockwell B Hardness

72

Shear Modulus

31 *GPa* 4.4 *x 10 ^{6} psi*

Shear Strength

290 *MPa* 42 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

420 *MPa* 61 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

370 *MPa* 53 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

130 *J/g*

Maximum Temperature: Mechanical

120 *°C* 260 *°F*

Melting Completion (Liquidus)

480 *°C* 900 *°F*

Melting Onset (Solidus)

380 *°C* 710 *°F*

Solidification (Pattern Maker's) Shrinkage

1.3 *%*

Specific Heat Capacity

530 *J/kg-K* 0.13 *BTU/lb-°F*

Thermal Conductivity

130 *W/m-K* 72 *BTU/h-ft-°F*

Thermal Expansion

26 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

30 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

53 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

11 *% relative*

Density

5.0 *g/cm ^{3}* 310

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

80 *MJ/kg* 34 *x 10 ^{3} BTU/lb*

Embodied Water

570 *L/kg* 68 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

18 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

870 *kJ/m ^{3}*

Stiffness to Weight: Axial

8.6 *points*

Stiffness to Weight: Bending

28 *points*

Strength to Weight: Axial

23 *points*

Strength to Weight: Bending

25 *points*

Thermal Diffusivity

47 *mm ^{2}/s*

Thermal Shock Resistance

15 *points*

## Alloy Composition

Zn | 69.3 to 73 | |

Al | 25 to 28 | |

Cu | 2.0 to 2.5 | |

Fe | 0 to 0.1 | |

Si | 0 to 0.080 | |

Mg | 0.010 to 0.020 | |

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