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A380.0 (A380.0-F, SC84C, A13800) Cast Aluminum

A380.0 aluminum is an aluminum alloy formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. A380.0 is the Aluminum Association (AA) designation for this material. A13800 is the UNS number. Additionally, the SAE designation is 306. And the AFNOR (French) designation is A-S9U3A-Y4. Older literature may refer to this material as ASTM SC84A, but this is now discouraged.

The graph bars on the material properties cards below compare A380.0 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

73 GPa 11 x 106 psi

Elongation at Break

3.3 %

Fatigue Strength

140 MPa 20 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

27 GPa 3.8 x 106 psi

Shear Strength

190 MPa 28 x 103 psi

Tensile Strength: Ultimate (UTS)

290 MPa 42 x 103 psi

Tensile Strength: Yield (Proof)

160 MPa 23 x 103 psi

Thermal Properties

Latent Heat of Fusion

510 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

590 °C 1100 °F

Melting Onset (Solidus)

550 °C 1020 °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

22 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

25 % IACS

Electrical Conductivity: Equal Weight (Specific)

78 % IACS

Otherwise Unclassified Properties

Base Metal Price

11 % relative

Calomel Potential

-710 mV

Density

2.9 g/cm3 180 lb/ft3

Embodied Carbon

7.5 kg CO2/kg material

Embodied Energy

140 MJ/kg 61 x 103 BTU/lb

Embodied Water

1040 L/kg 120 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

8.3 MJ/m3

Resilience: Unit (Modulus of Resilience)

180 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

48 points

Strength to Weight: Axial

28 points

Strength to Weight: Bending

34 points

Thermal Diffusivity

38 mm2/s

Thermal Shock Resistance

13 points

Alloy Composition

Among cast aluminum alloys, the composition of A380.0 aluminum is notable for containing comparatively high amounts of zinc (Zn) and copper (Cu). 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. Copper is used to improve strength. This comes at the cost of a decrease in corrosion resistance and weldability.

Aluminum (Al) 80.3 to 89.5
Silicon (Si) 7.5 to 9.5
Copper (Cu) 3.0 to 4.0
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

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