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240.0 (240.0-F) Cast Aluminum

240.0 aluminum is an aluminum alloy formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 240.0 is the Aluminum Association (AA) designation for this material. Additionally, the UNS number is A02400.

The graph bars on the material properties cards below compare 240.0 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

Elastic (Young's, Tensile) Modulus

72 GPa 10 x 106 psi

Elongation at Break

1.0 %

Fatigue Strength

140 MPa 20 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

27 GPa 3.9 x 106 psi

Tensile Strength: Ultimate (UTS)

240 MPa 34 x 103 psi

Tensile Strength: Yield (Proof)

200 MPa 29 x 103 psi

Thermal Properties

Latent Heat of Fusion

380 J/g

Maximum Temperature: Mechanical

180 °C 350 °F

Melting Completion (Liquidus)

600 °C 1120 °F

Melting Onset (Solidus)

520 °C 960 °F

Specific Heat Capacity

860 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

96 W/m-K 55 BTU/h-ft-°F

Thermal Expansion

22 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

23 % IACS

Electrical Conductivity: Equal Weight (Specific)

65 % IACS

Otherwise Unclassified Properties

Base Metal Price

12 % relative

Density

3.2 g/cm3 200 lb/ft3

Embodied Carbon

8.7 kg CO2/kg material

Embodied Energy

150 MJ/kg 62 x 103 BTU/lb

Embodied Water

1100 L/kg 130 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

2.2 MJ/m3

Resilience: Unit (Modulus of Resilience)

280 kJ/m3

Stiffness to Weight: Axial

12 points

Stiffness to Weight: Bending

43 points

Strength to Weight: Axial

20 points

Strength to Weight: Bending

26 points

Thermal Diffusivity

35 mm2/s

Thermal Shock Resistance

11 points

Alloy Composition

Among cast aluminum alloys, the composition of 240.0 aluminum is notable for containing comparatively high amounts of copper (Cu) and magnesium (Mg). Copper is used to improve strength. This comes at the cost of a decrease in corrosion resistance and weldability. Magnesium promotes hardenability through both heat treatment and strain hardening mechanisms. It also increases susceptibility to intergranular corrosion.

Aluminum (Al) 81.7 to 86.9
Copper (Cu) 7.0 to 9.0
Magnesium (Mg) 5.5 to 6.5
Manganese (Mn) 0.3 to 0.7
Nickel (Ni) 0.3 to 0.7
Silicon (Si) 0 to 0.5
Iron (Fe) 0 to 0.5
Titanium (Ti) 0 to 0.2
Zinc (Zn) 0 to 0.1
Residuals 0 to 0.15

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

Followup Questions

Similar Alloys

Further Reading

Handbook of Aluminum vol. 2: Alloy Production and Materials Manufacturing, George Totten and D. Scott MacKenzie (editors), 2003

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

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