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5056 (A95056) Aluminum

5056 aluminum is a 5000-series aluminum alloy: the main alloying addition is magnesium, and it is formulated for primary forming into wrought products. 5056 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-5056. A95056 is the UNS number.

It has been in use since 1936, but has only received its standard designation in 1954.

It can have the highest ductility and the highest tensile strength among 5000-series alloys.

The properties of 5056 aluminum include ten 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 5056 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

67 GPa 9.8 x 106 psi

Elongation at Break

4.9 to 31 %

Fatigue Strength

140 to 200 MPa 20 to 28 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

25 GPa 3.7 x 106 psi

Shear Strength

170 to 240 MPa 25 to 34 x 103 psi

Tensile Strength: Ultimate (UTS)

290 to 460 MPa 42 to 67 x 103 psi

Tensile Strength: Yield (Proof)

150 to 410 MPa 22 to 59 x 103 psi

Thermal Properties

Latent Heat of Fusion

400 J/g

Maximum Temperature: Mechanical

190 °C 370 °F

Melting Completion (Liquidus)

640 °C 1180 °F

Melting Onset (Solidus)

570 °C 1050 °F

Specific Heat Capacity

910 J/kg-K 0.22 BTU/lb-°F

Thermal Conductivity

130 W/m-K 73 BTU/h-ft-°F

Thermal Expansion

24 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

29 % IACS

Electrical Conductivity: Equal Weight (Specific)

99 % IACS

Otherwise Unclassified Properties

Base Metal Price

9.5 % relative

Calomel Potential

-780 mV

Density

2.7 g/cm3 170 lb/ft3

Embodied Carbon

9.0 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)

12 to 140 MJ/m3

Resilience: Unit (Modulus of Resilience)

170 to 1220 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

51 points

Strength to Weight: Axial

30 to 48 points

Strength to Weight: Bending

36 to 50 points

Thermal Diffusivity

53 mm2/s

Thermal Shock Resistance

13 to 20 points

Alloy Composition

Among wrought aluminum alloys, the composition of 5056 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) 93 to 95.4
Magnesium (Mg) 4.5 to 5.6
Iron (Fe) 0 to 0.4
Silicon (Si) 0 to 0.3
Manganese (Mn) 0.050 to 0.2
Chromium (Cr) 0.050 to 0.2
Zinc (Zn) 0 to 0.1
Copper (Cu) 0 to 0.1
Residuals 0 to 0.15

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

Followup Questions

Similar Alloys

Further Reading

ASTM B211: Standard Specification for Aluminum and Aluminum-Alloy Bar, Rod, and Wire

Aluminum Standards and Data, Aluminum Association Inc., 2013

ASM Specialty Handbook: Aluminum and Aluminum Alloys, J. R. Davis (editor), 1993