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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 106 psi

Elongation at Break

5.0 %

Fatigue Strength

140 MPa 20 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

25 GPa 3.7 x 106 psi

Shear Strength

200 MPa 29 x 103 psi

Tensile Strength: Ultimate (UTS)

310 MPa 45 x 103 psi

Tensile Strength: Yield (Proof)

190 MPa 28 x 103 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/cm3 170 lb/ft3

Embodied Carbon

9.4 kg CO2/kg material

Embodied Energy

150 MJ/kg 66 x 103 BTU/lb

Embodied Water

1160 L/kg 140 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

14 MJ/m3

Resilience: Unit (Modulus of Resilience)

270 kJ/m3

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 mm2/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.

Aluminum (Al) 88.1 to 92.5
Magnesium (Mg) 7.5 to 8.5
Iron (Fe) 0 to 1.8
Manganese (Mn) 0 to 0.35
Silicon (Si) 0 to 0.35
Copper (Cu) 0 to 0.25
Nickel (Ni) 0 to 0.15
Tin (Sn) 0 to 0.15
Zinc (Zn) 0 to 0.15
Residuals 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