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8021 (8021-H14) Aluminum

8021 aluminum is an otherwise-unclassified alloy of aluminum. Cited properties are appropriate for the H14 temper. To achieve this temper, the metal is strain hardened to a strength that is roughly halfway between annealed (O) and full-hard (H18). 8021 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-8021. Additionally, the UNS number is A98021.

It received its standard designation in 1992, making it a fairly young material.

The graph bars on the material properties cards below compare 8021 aluminum to: otherwise unclassified 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

Elastic (Young's, Tensile) Modulus

70 GPa 10 x 106 psi

Elongation at Break

2.3 %

Fatigue Strength

61 MPa 8.9 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

26 GPa 3.8 x 106 psi

Tensile Strength: Ultimate (UTS)

160 MPa 23 x 103 psi

Tensile Strength: Yield (Proof)

130 MPa 19 x 103 psi

Thermal Properties

Latent Heat of Fusion

400 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

650 °C 1210 °F

Melting Onset (Solidus)

640 °C 1180 °F

Specific Heat Capacity

900 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

220 W/m-K 130 BTU/h-ft-°F

Thermal Expansion

23 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

56 % IACS

Electrical Conductivity: Equal Weight (Specific)

180 % IACS

Otherwise Unclassified Properties

Base Metal Price

9.0 % relative

Density

2.8 g/cm3 170 lb/ft3

Embodied Carbon

8.1 kg CO2/kg material

Embodied Energy

150 MJ/kg 66 x 103 BTU/lb

Embodied Water

1180 L/kg 140 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

3.4 MJ/m3

Resilience: Unit (Modulus of Resilience)

130 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

49 points

Strength to Weight: Axial

16 points

Strength to Weight: Bending

23 points

Thermal Diffusivity

88 mm2/s

Thermal Shock Resistance

7.0 points

Alloy Composition

Aluminum (Al) 98 to 98.8
Iron (Fe) 1.2 to 1.7
Silicon (Si) 0 to 0.15
Copper (Cu) 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

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

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