EN AC-51200 (52100-F, AIMg9) Cast Aluminum
EN AC-51200 aluminum is an aluminum alloy formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 51200 is the EN numeric designation for this material. AIMg9 is the EN chemical designation.
It has the lowest electrical conductivity among Euronorm (EN) cast aluminums. In addition, it has the lowest thermal conductivity and a moderately low tensile strength.
The graph bars on the material properties cards below compare EN AC-51200 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
80
Elastic (Young's, Tensile) Modulus
67 GPa 9.7 x 106 psi
Elongation at Break
1.1 %
Fatigue Strength
100 MPa 15 x 103 psi
Poisson's Ratio
0.33
Shear Modulus
25 GPa 3.7 x 106 psi
Tensile Strength: Ultimate (UTS)
220 MPa 32 x 103 psi
Tensile Strength: Yield (Proof)
150 MPa 21 x 103 psi
Thermal Properties
Latent Heat of Fusion
410 J/g
Maximum Temperature: Mechanical
170 °C 340 °F
Melting Completion (Liquidus)
640 °C 1180 °F
Melting Onset (Solidus)
570 °C 1060 °F
Specific Heat Capacity
910 J/kg-K 0.22 BTU/lb-°F
Thermal Conductivity
92 W/m-K 53 BTU/h-ft-°F
Thermal Expansion
23 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
22 % IACS
Electrical Conductivity: Equal Weight (Specific)
74 % IACS
Otherwise Unclassified Properties
Base Metal Price
9.5 % relative
Density
2.6 g/cm3 160 lb/ft3
Embodied Carbon
9.6 kg CO2/kg material
Embodied Energy
150 MJ/kg 66 x 103 BTU/lb
Embodied Water
1150 L/kg 140 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
2.2 MJ/m3
Resilience: Unit (Modulus of Resilience)
160 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
51 points
Strength to Weight: Axial
24 points
Strength to Weight: Bending
31 points
Thermal Diffusivity
39 mm2/s
Thermal Shock Resistance
10 points
Alloy Composition
Among cast aluminum alloys, the composition of EN AC-51200 aluminum is notable for containing a comparatively high amount of magnesium (Mg) and including lead (Pb). Magnesium promotes hardenability through both heat treatment and strain hardening mechanisms. It also increases susceptibility to intergranular corrosion. Lead is used to improve machinability at the cost of toxicity and a decrease in weldability.
| Al | 84.5 to 92 | |
| Mg | 8.0 to 10.5 | |
| Si | 0 to 2.5 | |
| Fe | 0 to 1.0 | |
| Mn | 0 to 0.55 | |
| Zn | 0 to 0.25 | |
| Ti | 0 to 0.2 | |
| Ni | 0 to 0.1 | |
| Sn | 0 to 0.1 | |
| Pb | 0 to 0.1 | |
| Cu | 0 to 0.1 | |
| 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
Iron in Aluminium Alloys: Impurity and Alloying Element, N. A. Belov et al., 2002