# 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 10 ^{6} psi*

Elongation at Break

2.3 *%*

Fatigue Strength

61 *MPa* 8.9 *x 10 ^{3} psi*

Poisson's Ratio

0.33

Shear Modulus

26 *GPa* 3.8 *x 10 ^{6} psi*

Tensile Strength: Ultimate (UTS)

160 *MPa* 23 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

130 *MPa* 19 *x 10 ^{3} 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/cm ^{3}* 170

*lb/ft*

^{3}Embodied Carbon

8.1 *kg CO _{2}/kg material*

Embodied Energy

150 *MJ/kg* 66 *x 10 ^{3} BTU/lb*

Embodied Water

1180 *L/kg* 140 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

3.4 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

130 *kJ/m ^{3}*

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 *mm ^{2}/s*

Thermal Shock Resistance

7.0 *points*

## Alloy Composition

Al | 98 to 98.8 | |

Fe | 1.2 to 1.7 | |

Si | 0 to 0.15 | |

Cu | 0 to 0.050 | |

res. | 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