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384.0 (384.0-F, SC114A, A03840) Cast Aluminum

384.0 aluminum is an aluminum alloy formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 384.0 is the Aluminum Association (AA) designation for this material. A03840 is the UNS number. Additionally, the SAE designation is 303. The British Standard (BS) designation is LM2. And the AFNOR (French) designation is A-S9U3-Y4. Older literature may refer to this material as ASTM SC114A, but this is now discouraged.

The graph bars on the material properties cards below compare 384.0 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

85

Elastic (Young's, Tensile) Modulus

74 GPa 11 x 106 psi

Elongation at Break

2.5 %

Fatigue Strength

140 MPa 20 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

28 GPa 4.1 x 106 psi

Shear Strength

200 MPa 29 x 103 psi

Tensile Strength: Ultimate (UTS)

330 MPa 48 x 103 psi

Tensile Strength: Yield (Proof)

170 MPa 25 x 103 psi

Thermal Properties

Latent Heat of Fusion

550 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

580 °C 1080 °F

Melting Onset (Solidus)

530 °C 980 °F

Specific Heat Capacity

870 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

96 W/m-K 56 BTU/h-ft-°F

Thermal Expansion

21 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

22 % IACS

Electrical Conductivity: Equal Weight (Specific)

69 % IACS

Otherwise Unclassified Properties

Base Metal Price

11 % relative

Density

2.9 g/cm3 180 lb/ft3

Embodied Carbon

7.4 kg CO2/kg material

Embodied Energy

140 MJ/kg 59 x 103 BTU/lb

Embodied Water

1010 L/kg 120 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

6.9 MJ/m3

Resilience: Unit (Modulus of Resilience)

190 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

49 points

Strength to Weight: Axial

32 points

Strength to Weight: Bending

37 points

Thermal Diffusivity

39 mm2/s

Thermal Shock Resistance

15 points

Alloy Composition

Among cast aluminum alloys, the composition of 384.0 aluminum is notable for containing comparatively high amounts of silicon (Si) and zinc (Zn). Silicon is used to improve casting fluidity and lower melting temperature. It also has a strengthening effect. Zinc is used to achieve significant increases in strength, at the cost of increased susceptibility to stress corrosion cracking. Among other things, this limits weldability.

Aluminum (Al) 77.3 to 86.5
Silicon (Si) 10.5 to 12
Copper (Cu) 3.0 to 4.5
Zinc (Zn) 0 to 3.0
Iron (Fe) 0 to 1.3
Manganese (Mn) 0 to 0.5
Nickel (Ni) 0 to 0.5
Tin (Sn) 0 to 0.35
Magnesium (Mg) 0 to 0.1
Residuals 0 to 0.5

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