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204.0-T6 Cast Aluminum

204.0-T6 aluminum is 204.0 aluminum in the T6 temper. To achieve this temper, the metal is solution heat-treated and artificially aged until it meets standard mechanical property requirements. The graph bars on the material properties cards below compare 204.0-T6 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

120

Elastic (Young's, Tensile) Modulus

71 GPa 10 x 106 psi

Elongation at Break

5.7 %

Fatigue Strength

63 MPa 9.1 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

27 GPa 3.8 x 106 psi

Tensile Strength: Ultimate (UTS)

230 MPa 34 x 103 psi

Tensile Strength: Yield (Proof)

180 MPa 26 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

34 % IACS

Electrical Conductivity: Equal Weight (Specific)

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 MJ/m3

Resilience: Unit (Modulus of Resilience)

220 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

46 points

Strength to Weight: Axial

21 points

Strength to Weight: Bending

28 points

Thermal Diffusivity

46 mm2/s

Thermal Shock Resistance

12 points

Alloy Composition

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

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

Followup Questions

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