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EN AC-21100 (AICu4Ti) Cast Aluminum

EN AC-21100 aluminum is an aluminum alloy formulated for casting. 21100 is the EN numeric designation for this material. AICu4Ti is the EN chemical designation.

It has a fairly high density among Euronorm (EN) cast aluminums. In addition, it can have a fairly high ductility and a fairly high tensile strength.

The properties of EN AC-21100 aluminum include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare EN AC-21100 aluminum to: Euronorm (EN) cast aluminums (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

100 to 110

Elastic (Young's, Tensile) Modulus

71 GPa 10 x 106 psi

Elongation at Break

6.2 to 7.3 %

Fatigue Strength

79 to 87 MPa 11 to 13 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

27 GPa 3.9 x 106 psi

Tensile Strength: Ultimate (UTS)

340 to 350 MPa 49 to 51 x 103 psi

Tensile Strength: Yield (Proof)

210 to 240 MPa 30 to 35 x 103 psi

Thermal Properties

Latent Heat of Fusion

390 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

670 °C 1230 °F

Melting Onset (Solidus)

550 °C 1020 °F

Specific Heat Capacity

880 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

130 W/m-K 74 BTU/h-ft-°F

Thermal Expansion

23 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

34 % IACS

Electrical Conductivity: Equal Weight (Specific)

100 % IACS

Otherwise Unclassified Properties

Base Metal Price

11 % relative

Density

3.0 g/cm3 190 lb/ft3

Embodied Carbon

8.0 kg CO2/kg material

Embodied Energy

150 MJ/kg 64 x 103 BTU/lb

Embodied Water

1150 L/kg 140 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

19 to 21 MJ/m3

Resilience: Unit (Modulus of Resilience)

300 to 400 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

46 points

Strength to Weight: Axial

31 to 33 points

Strength to Weight: Bending

36 to 37 points

Thermal Diffusivity

48 mm2/s

Thermal Shock Resistance

15 points

Alloy Composition

Among cast aluminum alloys, the composition of EN AC-21100 aluminum is notable for containing a comparatively high amount of copper (Cu). Copper is used to improve strength. This comes at the cost of a decrease in corrosion resistance and weldability.

Aluminum (Al) 93.4 to 95.7
Copper (Cu) 4.2 to 5.2
Manganese (Mn) 0 to 0.55
Titanium (Ti) 0.15 to 0.3
Iron (Fe) 0 to 0.19
Silicon (Si) 0 to 0.18
Zinc (Zn) 0 to 0.070
Residuals 0 to 0.1

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

Followup Questions

Similar Alloys

Further Reading

EN 1706: Aluminium and aluminium alloys. Castings. Chemical composition and mechanical properties

Aluminum: Properties and Physical Metallurgy, John E. Hatch (editor), 1984