EN AC-42000 (AISi7Mg) Cast Aluminum
EN AC-42000 aluminum is an aluminum alloy formulated for casting. 42000 is the EN numeric designation for this material. AISi7Mg is the EN chemical designation.
It has a fairly high thermal conductivity among Euronorm (EN) cast aluminums. In addition, it has a moderately high melting temperature and a moderately high electrical conductivity.
The properties of EN AC-42000 aluminum include three 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 EN AC-42000 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
59 to 91
Elastic (Young's, Tensile) Modulus
70 GPa 10 x 106 psi
Elongation at Break
1.1 to 2.4 %
Fatigue Strength
67 to 76 MPa 9.7 to 11 x 103 psi
Poisson's Ratio
0.33
Shear Modulus
26 GPa 3.8 x 106 psi
Tensile Strength: Ultimate (UTS)
170 to 270 MPa 25 to 39 x 103 psi
Tensile Strength: Yield (Proof)
95 to 230 MPa 14 to 33 x 103 psi
Thermal Properties
Latent Heat of Fusion
500 J/g
Maximum Temperature: Mechanical
170 °C 340 °F
Melting Completion (Liquidus)
610 °C 1130 °F
Melting Onset (Solidus)
600 °C 1110 °F
Specific Heat Capacity
900 J/kg-K 0.22 BTU/lb-°F
Thermal Conductivity
160 W/m-K 91 BTU/h-ft-°F
Thermal Expansion
22 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
38 % IACS
Electrical Conductivity: Equal Weight (Specific)
130 % IACS
Otherwise Unclassified Properties
Base Metal Price
9.5 % relative
Density
2.6 g/cm3 160 lb/ft3
Embodied Carbon
8.0 kg CO2/kg material
Embodied Energy
150 MJ/kg 64 x 103 BTU/lb
Embodied Water
1110 L/kg 130 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
2.8 to 5.7 MJ/m3
Resilience: Unit (Modulus of Resilience)
64 to 370 kJ/m3
Stiffness to Weight: Axial
15 points
Stiffness to Weight: Bending
53 points
Strength to Weight: Axial
18 to 28 points
Strength to Weight: Bending
26 to 35 points
Thermal Diffusivity
66 mm2/s
Thermal Shock Resistance
7.9 to 12 points
Alloy Composition
Among cast aluminum alloys, the composition of EN AC-42000 aluminum is notable for including lead (Pb) and tin (Sn). Lead is used to improve machinability at the cost of toxicity and a decrease in weldability. Tin is used to increase bearing properties at the cost of a decrease in corrosion resistance.
| Al | 89.9 to 93.3 | |
| Si | 6.5 to 7.5 | |
| Mg | 0.2 to 0.65 | |
| Fe | 0 to 0.55 | |
| Mn | 0 to 0.35 | |
| Ti | 0 to 0.25 | |
| Cu | 0 to 0.2 | |
| Ni | 0 to 0.15 | |
| Pb | 0 to 0.15 | |
| Zn | 0 to 0.15 | |
| Sn | 0 to 0.050 | |
| res. | 0 to 0.15 |
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 Bonding Technology and Data, J. D. Minford, 1993