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EN AC-21000 (21000-T4, AICu4MgTi) Cast Aluminum

EN AC-21000 aluminum is an aluminum alloy formulated for casting. Cited properties are appropriate for the T4 temper. To achieve this temper, the metal is solution heat-treated and naturally aged. 21000 is the EN numeric designation for this material. AICu4MgTi is the EN chemical designation.

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

The graph bars on the material properties cards below compare EN AC-21000 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

Elastic (Young's, Tensile) Modulus

71 GPa 10 x 106 psi

Elongation at Break

6.7 %

Fatigue Strength

100 MPa 15 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

27 GPa 3.8 x 106 psi

Tensile Strength: Ultimate (UTS)

340 MPa 50 x 103 psi

Tensile Strength: Yield (Proof)

240 MPa 34 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 65 x 103 BTU/lb

Embodied Water

1150 L/kg 140 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

21 MJ/m3

Resilience: Unit (Modulus of Resilience)

390 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

46 points

Strength to Weight: Axial

32 points

Strength to Weight: Bending

36 points

Thermal Diffusivity

49 mm2/s

Thermal Shock Resistance

15 points

Alloy Composition

Among cast aluminum alloys, the composition of EN AC-21000 aluminum is notable for containing a comparatively high amount of copper (Cu) and including lead (Pb). Copper is used to improve strength. This comes at the cost of a decrease in corrosion resistance and weldability. Lead is used to improve machinability at the cost of toxicity and a decrease in weldability.

Aluminum (Al) 93.4 to 95.5
Copper (Cu) 4.2 to 5.0
Magnesium (Mg) 0.15 to 0.35
Titanium (Ti) 0.15 to 0.3
Iron (Fe) 0 to 0.35
Silicon (Si) 0 to 0.2
Manganese (Mn) 0 to 0.1
Zinc (Zn) 0 to 0.1
Nickel (Ni) 0 to 0.050
Tin (Sn) 0 to 0.050
Lead (Pb) 0 to 0.050
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

Handbook of Aluminum vol. 2: Alloy Production and Materials Manufacturing, George Totten and D. Scott MacKenzie (editors), 2003