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204.0 (A02040) Cast Aluminum

204.0 aluminum is an aluminum alloy formulated for casting. 204.0 is the Aluminum Association (AA) designation for this material. A02040 is the UNS number.

The properties of 204.0 aluminum include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare 204.0 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

90 to 120

Elastic (Young's, Tensile) Modulus

71 GPa 10 x 106 psi

Elongation at Break

5.7 to 7.8 %

Fatigue Strength

63 to 77 MPa 9.1 to 11 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

27 GPa 3.8 x 106 psi

Tensile Strength: Ultimate (UTS)

230 to 340 MPa 34 to 49 x 103 psi

Tensile Strength: Yield (Proof)

180 to 220 MPa 26 to 32 x 103 psi

Thermal Properties

Latent Heat of Fusion

390 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

650 °C 1200 °F

Melting Onset (Solidus)

580 °C 1080 °F

Solidification (Pattern Maker's) Shrinkage

1.3 %

Specific Heat Capacity

880 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

120 W/m-K 70 BTU/h-ft-°F

Thermal Expansion

19 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

29 to 34 % IACS

Electrical Conductivity: Equal Weight (Specific)

87 to 100 % IACS

Otherwise Unclassified Properties

Base Metal Price

11 % relative

Density

3.0 g/cm3 190 lb/ft3

Embodied Carbon

8.0 kg CO2/kg material

Embodied Energy

150 MJ/kg 65 x 103 BTU/lb

Embodied Water

1150 L/kg 140 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

12 to 23 MJ/m3

Resilience: Unit (Modulus of Resilience)

220 to 350 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

46 points

Strength to Weight: Axial

21 to 31 points

Strength to Weight: Bending

28 to 36 points

Thermal Diffusivity

46 mm2/s

Thermal Shock Resistance

12 to 18 points

Alloy Composition

Among cast aluminum alloys, the composition of 204.0 aluminum is notable for containing a comparatively high amount of copper (Cu). Copper is used to improve strength. This comes at the cost of a decrease in corrosion resistance and weldability.

Aluminum (Al) 93.4 to 95.5
Copper (Cu) 4.2 to 5.0
Magnesium (Mg) 0.15 to 0.35
Titanium (Ti) 0.15 to 0.3
Iron (Fe) 0 to 0.35
Silicon (Si) 0 to 0.2
Manganese (Mn) 0 to 0.1
Zinc (Zn) 0 to 0.1
Nickel (Ni) 0 to 0.050
Tin (Sn) 0 to 0.050
Residuals 0 to 0.15

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

Followup Questions

Similar Alloys

Further Reading

ASTM B618: Standard Specification for Aluminum-Alloy Investment Castings

ASTM B108: Standard Specification for Aluminum-Alloy Permanent Mold Castings

ASTM B26: Standard Specification for Aluminum-Alloy Sand Castings

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

Advanced Materials in Automotive Engineering, Jason Rowe (editor), 2012

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