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324.0 Cast Aluminum

324.0 aluminum is an aluminum alloy formulated for casting. 324.0 is the Aluminum Association (AA) designation for this material. Additionally, the UNS number is A03240.

The properties of 324.0 aluminum include three common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare 324.0 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

71 GPa 10 x 106 psi

Elongation at Break

3.0 to 4.0 %

Fatigue Strength

77 to 89 MPa 11 to 13 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

27 GPa 3.9 x 106 psi

Tensile Strength: Ultimate (UTS)

210 to 310 MPa 30 to 45 x 103 psi

Tensile Strength: Yield (Proof)

110 to 270 MPa 16 to 39 x 103 psi

Thermal Properties

Latent Heat of Fusion

500 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

610 °C 1120 °F

Melting Onset (Solidus)

550 °C 1010 °F

Specific Heat Capacity

900 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

150 W/m-K 85 BTU/h-ft-°F

Thermal Expansion

21 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

34 % IACS

Electrical Conductivity: Equal Weight (Specific)

120 % IACS

Otherwise Unclassified Properties

Base Metal Price

9.5 % relative

Density

2.7 g/cm3 170 lb/ft3

Embodied Carbon

7.9 kg CO2/kg material

Embodied Energy

150 MJ/kg 63 x 103 BTU/lb

Embodied Water

1090 L/kg 130 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

6.8 to 8.9 MJ/m3

Resilience: Unit (Modulus of Resilience)

85 to 510 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

52 points

Strength to Weight: Axial

22 to 32 points

Strength to Weight: Bending

29 to 38 points

Thermal Diffusivity

62 mm2/s

Thermal Shock Resistance

9.7 to 14 points

Alloy Composition

Among cast aluminum alloys, the composition of 324.0 aluminum is notable for containing a comparatively high amount of silicon (Si). Silicon is used to improve casting fluidity and lower melting temperature. It also has a strengthening effect.

Aluminum (Al) 87.3 to 92.2
Silicon (Si) 7.0 to 8.0
Iron (Fe) 0 to 1.2
Magnesium (Mg) 0.4 to 0.7
Zinc (Zn) 0 to 1.0
Copper (Cu) 0.4 to 0.6
Manganese (Mn) 0 to 0.5
Nickel (Ni) 0 to 0.3
Titanium (Ti) 0 to 0.2
Residuals 0 to 0.2

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

Followup Questions

Similar Alloys

Further Reading

Aluminum: Properties and Physical Metallurgy, John E. Hatch (editor), 1984

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993