# Sand Cast Zinc-Aluminum 12

Sand cast ZA-12 is ZA-12 in the as-fabricated (no temper or treatment) condition. It has the lowest strength and lowest ductility compared to the other variants of ZA-12. The graph bars on the material properties cards below compare sand cast ZA-12 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

96

Compressive (Crushing) Strength

230 *MPa* 33 *x 10 ^{3} psi*

Elastic (Young's, Tensile) Modulus

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

Elongation at Break

1.6 *%*

Fatigue Strength

73 *MPa* 11 *x 10 ^{3} psi*

Fracture Toughness

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

*x 10*

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

120

Poisson's Ratio

0.26

Rockwell B Hardness

59

Shear Modulus

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

Shear Strength

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

Tensile Strength: Ultimate (UTS)

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

Tensile Strength: Yield (Proof)

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

## Thermal Properties

Latent Heat of Fusion

120 *J/g*

Maximum Temperature: Mechanical

100 *°C* 220 *°F*

Melting Completion (Liquidus)

430 *°C* 810 *°F*

Melting Onset (Solidus)

380 *°C* 710 *°F*

Solidification (Pattern Maker's) Shrinkage

1.3 *%*

Specific Heat Capacity

450 *J/kg-K* 0.11 *BTU/lb-°F*

Thermal Conductivity

120 *W/m-K* 67 *BTU/h-ft-°F*

Thermal Expansion

24 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

28 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

42 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

11 *% relative*

Density

6.0 *g/cm ^{3}* 380

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

64 *MJ/kg* 28 *x 10 ^{3} BTU/lb*

Embodied Water

440 *L/kg* 52 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

4.0 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

260 *kJ/m ^{3}*

Stiffness to Weight: Axial

7.6 *points*

Stiffness to Weight: Bending

24 *points*

Strength to Weight: Axial

12 *points*

Strength to Weight: Bending

15 *points*

Thermal Diffusivity

43 *mm ^{2}/s*

Thermal Shock Resistance

9.4 *points*

## Alloy Composition

Zn | 87.1 to 89 | |

Al | 10.5 to 11.5 | |

Cu | 0.5 to 1.2 | |

Fe | 0 to 0.075 | |

Si | 0 to 0.060 | |

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

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