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EN AC-71100 (71100-T1, AIZn10Si8Mg) Cast Aluminum

EN AC-71100 aluminum is an aluminum alloy formulated for casting. Cited properties are appropriate for the T1 temper. To achieve this temper, the metal is naturally aged until it meets standard mechanical property requirements. 71100 is the EN numeric designation for this material. AIZn10Si8Mg is the EN chemical designation.

It has a fairly low melting temperature and a moderately high density among Euronorm (EN) cast aluminums.

The graph bars on the material properties cards below compare EN AC-71100 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

110

Elastic (Young's, Tensile) Modulus

72 GPa 10 x 106 psi

Elongation at Break

1.1 %

Fatigue Strength

150 MPa 22 x 103 psi

Poisson's Ratio

0.32

Shear Modulus

27 GPa 4.0 x 106 psi

Tensile Strength: Ultimate (UTS)

260 MPa 38 x 103 psi

Tensile Strength: Yield (Proof)

230 MPa 33 x 103 psi

Thermal Properties

Latent Heat of Fusion

490 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

580 °C 1070 °F

Melting Onset (Solidus)

520 °C 960 °F

Specific Heat Capacity

860 J/kg-K 0.2 BTU/lb-°F

Thermal Expansion

22 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

32 % IACS

Electrical Conductivity: Equal Weight (Specific)

97 % IACS

Otherwise Unclassified Properties

Base Metal Price

9.5 % relative

Density

2.9 g/cm3 180 lb/ft3

Embodied Carbon

7.4 kg CO2/kg material

Embodied Energy

140 MJ/kg 59 x 103 BTU/lb

Embodied Water

1010 L/kg 120 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

2.8 MJ/m3

Resilience: Unit (Modulus of Resilience)

360 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

47 points

Strength to Weight: Axial

25 points

Strength to Weight: Bending

31 points

Thermal Shock Resistance

12 points

Alloy Composition

Among cast aluminum alloys, the composition of EN AC-71100 aluminum is notable for containing a comparatively high amount of zinc (Zn). Zinc is used to achieve significant increases in strength, at the cost of increased susceptibility to stress corrosion cracking. Among other things, this limits weldability.

Aluminum (Al) 78.7 to 83.3
Zinc (Zn) 9.0 to 10.5
Silicon (Si) 7.5 to 9.5
Magnesium (Mg) 0.2 to 0.5
Iron (Fe) 0 to 0.3
Manganese (Mn) 0 to 0.15
Titanium (Ti) 0 to 0.15
Copper (Cu) 0 to 0.1
Residuals 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 vol. 2: Alloy Production and Materials Manufacturing, George Totten and D. Scott MacKenzie (editors), 2003