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7204-O Aluminum

7204-O aluminum is 7204 aluminum in the annealed condition. It has the lowest strength compared to the other variants of 7204 aluminum. The graph bars on the material properties cards below compare 7204-O aluminum to: 7000-series alloys (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

70 GPa 10 x 106 psi

Elongation at Break

13 %

Fatigue Strength

130 MPa 18 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

26 GPa 3.8 x 106 psi

Shear Strength

130 MPa 19 x 103 psi

Tensile Strength: Ultimate (UTS)

220 MPa 31 x 103 psi

Tensile Strength: Yield (Proof)

120 MPa 18 x 103 psi

Thermal Properties

Latent Heat of Fusion

380 J/g

Maximum Temperature: Mechanical

210 °C 400 °F

Melting Completion (Liquidus)

640 °C 1180 °F

Melting Onset (Solidus)

520 °C 970 °F

Specific Heat Capacity

880 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

150 W/m-K 86 BTU/h-ft-°F

Thermal Expansion

24 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

39 % IACS

Electrical Conductivity: Equal Weight (Specific)

120 % IACS

Otherwise Unclassified Properties

Base Metal Price

9.5 % relative

Density

2.9 g/cm3 180 lb/ft3

Embodied Carbon

8.4 kg CO2/kg material

Embodied Energy

150 MJ/kg 66 x 103 BTU/lb

Embodied Water

1140 L/kg 140 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

25 MJ/m3

Resilience: Unit (Modulus of Resilience)

110 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

47 points

Strength to Weight: Axial

21 points

Strength to Weight: Bending

28 points

Thermal Diffusivity

58 mm2/s

Thermal Shock Resistance

9.4 points

Alloy Composition

Aluminum (Al)Al 90.5 to 94.8
Zinc (Zn)Zn 4.0 to 5.0
Magnesium (Mg)Mg 1.0 to 2.0
Manganese (Mn)Mn 0.2 to 0.7
Iron (Fe)Fe 0 to 0.35
Silicon (Si)Si 0 to 0.3
Chromium (Cr)Cr 0 to 0.3
Zirconium (Zr)Zr 0 to 0.25
Titanium (Ti)Ti 0 to 0.2
Copper (Cu)Cu 0 to 0.2
Vanadium (V)V 0 to 0.1
Residualsres. 0 to 0.15

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

Followup Questions

Further Reading

Handbook of Aluminum Bonding Technology and Data, J. D. Minford, 1993

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

ISO 6361-2: Wrought aluminium and aluminium alloys - Sheets, strips and plates - Part 2: Mechanical properties