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2117 (2117-T4, AlCu2.5Mg , 3.1305) Aluminum

2117 aluminum is a 2000-series aluminum alloy: the main alloying addition is copper, and it is formulated for primary forming into wrought products. Cited properties are appropriate for the T4 temper. To achieve this temper, the metal is solution heat-treated and naturally aged. 2117 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-2117. Additionally, the EN chemical designation is AlCu2,5Mg. The British Standard (BS) designation is 2L69. The AFNOR (French) designation is A-U2G. And the UNS number is A92117.

It originally received its standard designation in 1954.

It has the highest ductility among the 2000-series alloys in the database.

The graph bars on the material properties cards below compare 2117 aluminum to: 2000-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

Brinell Hardness

70

Elastic (Young's, Tensile) Modulus

71 GPa 10 x 106 psi

Elongation at Break

26 %

Fatigue Strength

95 MPa 14 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

27 GPa 3.9 x 106 psi

Shear Strength

200 MPa 28 x 103 psi

Tensile Strength: Ultimate (UTS)

300 MPa 43 x 103 psi

Tensile Strength: Yield (Proof)

170 MPa 24 x 103 psi

Thermal Properties

Latent Heat of Fusion

400 J/g

Maximum Temperature: Mechanical

220 °C 420 °F

Melting Completion (Liquidus)

650 °C 1200 °F

Melting Onset (Solidus)

550 °C 1030 °F

Specific Heat Capacity

880 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

150 W/m-K 89 BTU/h-ft-°F

Thermal Expansion

24 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

40 % IACS

Electrical Conductivity: Equal Weight (Specific)

120 % IACS

Otherwise Unclassified Properties

Base Metal Price

10 % relative

Density

3.0 g/cm3 180 lb/ft3

Embodied Carbon

8.2 kg CO2/kg material

Embodied Energy

150 MJ/kg 65 x 103 BTU/lb

Embodied Water

1150 L/kg 140 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

64 MJ/m3

Resilience: Unit (Modulus of Resilience)

190 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

47 points

Strength to Weight: Axial

28 points

Strength to Weight: Bending

33 points

Thermal Diffusivity

59 mm2/s

Thermal Shock Resistance

12 points

Alloy Composition

Among wrought aluminum alloys, the composition of 2117 aluminum is notable for containing a comparatively high amount of copper (Cu) and including zirconium (Zr). Copper is used to improve strength. This comes at the cost of a decrease in corrosion resistance and weldability. Zirconium is used to increase an alloy's recrystallization temperature, which increases the temperature at which the alloy can be used without permanent loss of mechanical properties.

Aluminum (Al) 91 to 97.6
Copper (Cu) 2.2 to 4.5
Manganese (Mn) 0.4 to 1.0
Magnesium (Mg) 0.2 to 1.0
Silicon (Si) 0.2 to 0.8
Iron (Fe) 0 to 0.7
Titanium (Ti) 0 to 0.25
Zirconium (Zr) 0 to 0.25
Zinc (Zn) 0 to 0.25
Chromium (Cr) 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

Aluminum Standards and Data, Aluminum Association Inc., 2013

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

EN 573-3: Aluminium and aluminium alloys. Chemical composition and form of wrought products. Chemical composition and form of products