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.
| Al | 91 to 97.6 | |
| Cu | 2.2 to 4.5 | |
| Mn | 0.4 to 1.0 | |
| Mg | 0.2 to 1.0 | |
| Si | 0.2 to 0.8 | |
| Fe | 0 to 0.7 | |
| Ti | 0 to 0.25 | |
| Zr | 0 to 0.25 | |
| Zn | 0 to 0.25 | |
| Cr | 0 to 0.1 | |
| res. | 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