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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.

Aluminum (Al) 94.6 to 97.4
Silicon (Si) 1.8 to 2.2
Manganese (Mn) 0.6 to 1.2
Iron (Fe) 0 to 0.7
Copper (Cu) 0.1 to 0.5
Magnesium (Mg) 0.1 to 0.5
Zinc (Zn) 0 to 0.2
Residuals 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