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.
| Al | 93.4 to 95.7 | |
| Cu | 4.2 to 5.2 | |
| Mn | 0 to 0.55 | |
| Ti | 0.15 to 0.3 | |
| Fe | 0 to 0.19 | |
| Si | 0 to 0.18 | |
| Zn | 0 to 0.070 | |
| res. | 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