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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.

Aluminum (Al) 91.3 to 93.3
Silicon (Si) 6.5 to 7.5
Magnesium (Mg) 0.25 to 0.45
Titanium (Ti) 0 to 0.25
Iron (Fe) 0 to 0.19
Manganese (Mn) 0 to 0.1
Zinc (Zn) 0 to 0.070
Copper (Cu) 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 Bonding Technology and Data, J. D. Minford, 1993