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5021 Aluminum

5021 aluminum is a 5000-series aluminum alloy: the main alloying addition is magnesium, and it is formulated for primary forming into wrought products. 5021 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-5021. Additionally, the UNS number is A95021.

It received its standard designation in 1993, making it a fairly young material.

The properties of 5021 aluminum include four common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare 5021 aluminum to: 5000-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

68 GPa 9.9 x 106 psi

Elongation at Break

1.1 to 3.4 %

Fatigue Strength

85 to 110 MPa 12 to 16 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

26 GPa 3.7 x 106 psi

Shear Strength

170 MPa 25 x 103 psi

Tensile Strength: Ultimate (UTS)

300 to 310 MPa 43 to 45 x 103 psi

Tensile Strength: Yield (Proof)

240 to 270 MPa 36 to 40 x 103 psi

Thermal Properties

Latent Heat of Fusion

400 J/g

Maximum Temperature: Mechanical

180 °C 360 °F

Melting Completion (Liquidus)

640 °C 1190 °F

Melting Onset (Solidus)

590 °C 1090 °F

Specific Heat Capacity

900 J/kg-K 0.22 BTU/lb-°F

Thermal Conductivity

140 W/m-K 81 BTU/h-ft-°F

Thermal Expansion

23 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

35 % IACS

Electrical Conductivity: Equal Weight (Specific)

120 % IACS

Otherwise Unclassified Properties

Base Metal Price

9.5 % relative

Density

2.7 g/cm3 170 lb/ft3

Embodied Carbon

8.6 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)

3.1 to 10 MJ/m3

Resilience: Unit (Modulus of Resilience)

440 to 550 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

50 points

Strength to Weight: Axial

30 to 32 points

Strength to Weight: Bending

37 points

Thermal Diffusivity

57 mm2/s

Thermal Shock Resistance

13 to 14 points

Alloy Composition

Among wrought aluminum alloys, the composition of 5021 aluminum is notable for containing a comparatively high amount of magnesium (Mg). Magnesium promotes hardenability through both heat treatment and strain hardening mechanisms. It also increases susceptibility to intergranular corrosion.

Aluminum (Al) 95.2 to 97.7
Magnesium (Mg) 2.2 to 2.8
Manganese (Mn) 0.1 to 0.5
Iron (Fe) 0 to 0.5
Silicon (Si) 0 to 0.4
Chromium (Cr) 0 to 0.15
Zinc (Zn) 0 to 0.15
Copper (Cu) 0 to 0.15
Residuals 0 to 0.15

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

Followup Questions

Similar Alloys

Further Reading

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

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015