# 518.0 (518.0-F, G8A, A05180) Cast Aluminum

518.0 aluminum is an aluminum alloy formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 518.0 is the Aluminum Association (AA) designation for this material. A05180 is the UNS number. Older literature may refer to this material as ASTM G8A, but this is now discouraged.

The graph bars on the material properties cards below compare 518.0 aluminum to: ANSI/AA cast aluminums (top), all aluminum 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

80

Elastic (Young's, Tensile) Modulus

67 *GPa* 9.8 *x 10 ^{6} psi*

Elongation at Break

5.0 *%*

Fatigue Strength

140 *MPa* 20 *x 10 ^{3} psi*

Poisson's Ratio

0.33

Shear Modulus

25 *GPa* 3.7 *x 10 ^{6} psi*

Shear Strength

200 *MPa* 29 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

310 *MPa* 45 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

190 *MPa* 28 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

390 *J/g*

Maximum Temperature: Mechanical

170 *°C* 340 *°F*

Melting Completion (Liquidus)

620 *°C* 1150 *°F*

Melting Onset (Solidus)

560 *°C* 1040 *°F*

Specific Heat Capacity

900 *J/kg-K* 0.22 *BTU/lb-°F*

Thermal Conductivity

98 *W/m-K* 56 *BTU/h-ft-°F*

Thermal Expansion

24 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

24 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

81 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

9.5 *% relative*

Density

2.7 *g/cm ^{3}* 170

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

150 *MJ/kg* 66 *x 10 ^{3} BTU/lb*

Embodied Water

1160 *L/kg* 140 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

14 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

270 *kJ/m ^{3}*

Stiffness to Weight: Axial

14 *points*

Stiffness to Weight: Bending

51 *points*

Strength to Weight: Axial

32 *points*

Strength to Weight: Bending

38 *points*

Thermal Diffusivity

40 *mm ^{2}/s*

Thermal Shock Resistance

14 *points*

## Alloy Composition

Among cast aluminum alloys, the composition of 518.0 aluminum is notable for containing a comparatively high amount of magnesium (Mg). Magnesium promotes hardenability through both heat treatment and strain hardening mechanisms. It also increases susceptibility to intergranular corrosion.

Al | 88.1 to 92.5 | |

Mg | 7.5 to 8.5 | |

Fe | 0 to 1.8 | |

Mn | 0 to 0.35 | |

Si | 0 to 0.35 | |

Cu | 0 to 0.25 | |

Ni | 0 to 0.15 | |

Sn | 0 to 0.15 | |

Zn | 0 to 0.15 | |

res. | 0 to 0.25 |

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

## Followup Questions

## Similar Alloys

## Further Reading

ASTM B85: Standard Specification for Aluminum-Alloy Die Castings

Iron in Aluminium Alloys: Impurity and Alloying Element, N. A. Belov et al., 2002

ASM Specialty Handbook: Aluminum and Aluminum Alloys, J. R. Davis (editor), 1993