4115 (AlSi2MnMgCu) Aluminum
4115 aluminum is a 4000-series aluminum alloy. The main alloying addition is silicon. 4115 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-4115. AlSi2MnMgCu is the EN chemical designation. Additionally, the UNS number is A94115.
It has only received its standard designation in 2006, making it a very young material.
The properties of 4115 aluminum include six 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 4115 aluminum to: 4000-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
38 to 68
Elastic (Young's, Tensile) Modulus
70 GPa 10 x 106 psi
Elongation at Break
1.1 to 11 %
Fatigue Strength
39 to 76 MPa 5.7 to 11 x 103 psi
Poisson's Ratio
0.33
Shear Modulus
26 GPa 3.8 x 106 psi
Shear Strength
71 to 130 MPa 10 to 18 x 103 psi
Tensile Strength: Ultimate (UTS)
120 to 220 MPa 17 to 32 x 103 psi
Tensile Strength: Yield (Proof)
39 to 190 MPa 5.7 to 28 x 103 psi
Thermal Properties
Latent Heat of Fusion
420 J/g
Maximum Temperature: Mechanical
160 °C 320 °F
Melting Completion (Liquidus)
640 °C 1180 °F
Melting Onset (Solidus)
590 °C 1100 °F
Specific Heat Capacity
900 J/kg-K 0.21 BTU/lb-°F
Thermal Conductivity
160 W/m-K 94 BTU/h-ft-°F
Thermal Expansion
23 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
41 % IACS
Electrical Conductivity: Equal Weight (Specific)
140 % IACS
Otherwise Unclassified Properties
Base Metal Price
9.5 % relative
Density
2.7 g/cm3 170 lb/ft3
Embodied Carbon
8.1 kg CO2/kg material
Embodied Energy
150 MJ/kg 65 x 103 BTU/lb
Embodied Water
1160 L/kg 140 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
2.1 to 10 MJ/m3
Resilience: Unit (Modulus of Resilience)
11 to 270 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
50 points
Strength to Weight: Axial
12 to 23 points
Strength to Weight: Bending
20 to 30 points
Thermal Diffusivity
66 mm2/s
Thermal Shock Resistance
5.2 to 9.9 points
Alloy Composition
Among wrought aluminum alloys, the composition of 4115 aluminum is notable for containing a comparatively high amount of silicon (Si). Silicon is used to increase strength at the expense of ductility. It also lowers the melting temperature and raises the fluidity of the alloy.
| Al | 94.6 to 97.4 | |
| Si | 1.8 to 2.2 | |
| Mn | 0.6 to 1.2 | |
| Fe | 0 to 0.7 | |
| Cu | 0.1 to 0.5 | |
| Mg | 0.1 to 0.5 | |
| Zn | 0 to 0.2 | |
| res. | 0 to 0.15 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
Aluminum: Properties and Physical Metallurgy, John E. Hatch (editor), 1984
EN 485-2: Aluminium and aluminium alloys. Sheet, strip and plate. Mechanical properties