EN AC-42100 (AISi7Mg0.3) Cast Aluminum
EN AC-42100 aluminum is an aluminum alloy formulated for casting. 42100 is the EN numeric designation for this material. Additionally, the EN chemical designation is AISi7Mg0,3.
It has the highest electrical conductivity among Euronorm (EN) cast aluminums. In addition, it has a moderately high melting temperature and a moderately high thermal conductivity.
The properties of EN AC-42100 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-42100 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
91
Elastic (Young's, Tensile) Modulus
70 GPa 10 x 106 psi
Elongation at Break
3.4 to 9.0 %
Fatigue Strength
76 to 82 MPa 11 to 12 x 103 psi
Poisson's Ratio
0.33
Shear Modulus
26 GPa 3.8 x 106 psi
Tensile Strength: Ultimate (UTS)
280 to 290 MPa 41 to 42 x 103 psi
Tensile Strength: Yield (Proof)
210 to 230 MPa 30 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 1120 °F
Specific Heat Capacity
910 J/kg-K 0.22 BTU/lb-°F
Thermal Conductivity
150 W/m-K 89 BTU/h-ft-°F
Thermal Expansion
22 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
2.6 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)
9.1 to 23 MJ/m3
Resilience: Unit (Modulus of Resilience)
300 to 370 kJ/m3
Stiffness to Weight: Axial
15 points
Stiffness to Weight: Bending
53 points
Strength to Weight: Axial
30 to 31 points
Strength to Weight: Bending
37 to 38 points
Thermal Diffusivity
66 mm2/s
Thermal Shock Resistance
13 points
Alloy Composition
Among cast aluminum alloys, the composition of EN AC-42100 aluminum is notable for containing a comparatively high amount of silicon (Si). Silicon is used to improve casting fluidity and lower melting temperature. It also has a strengthening effect.
| Al | 91.3 to 93.3 | |
| Si | 6.5 to 7.5 | |
| Mg | 0.25 to 0.45 | |
| Ti | 0 to 0.25 | |
| Fe | 0 to 0.19 | |
| Mn | 0 to 0.1 | |
| Zn | 0 to 0.070 | |
| Cu | 0 to 0.050 | |
| 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
Handbook of Aluminum Bonding Technology and Data, J. D. Minford, 1993