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512.0 (512.0-F, formerly B514.0, SG42A, A05120) Cast Aluminum

512.0 aluminum is an aluminum alloy formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 512.0 is the Aluminum Association (AA) designation for this material. A05120 is the UNS number. Older literature may refer to this material as ASTM SG42A or B514.0.

It has a moderately low tensile strength among the ANSI/AA cast aluminums in the database.

The graph bars on the material properties cards below compare 512.0 aluminum to: ANSI/AA 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

50

Elastic (Young's, Tensile) Modulus

69 GPa 10 x 106 psi

Elongation at Break

2.0 %

Fatigue Strength

58 MPa 8.4 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

26 GPa 3.8 x 106 psi

Tensile Strength: Ultimate (UTS)

130 MPa 19 x 103 psi

Tensile Strength: Yield (Proof)

83 MPa 12 x 103 psi

Thermal Properties

Latent Heat of Fusion

420 J/g

Maximum Temperature: Mechanical

180 °C 350 °F

Melting Completion (Liquidus)

630 °C 1170 °F

Melting Onset (Solidus)

590 °C 1090 °F

Specific Heat Capacity

900 J/kg-K 0.22 BTU/lb-°F

Thermal Conductivity

150 W/m-K 85 BTU/h-ft-°F

Thermal Expansion

23 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

2.7 g/cm3 170 lb/ft3

Embodied Carbon

8.8 kg CO2/kg material

Embodied Energy

150 MJ/kg 66 x 103 BTU/lb

Embodied Water

1160 L/kg 140 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

2.3 MJ/m3

Resilience: Unit (Modulus of Resilience)

50 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

51 points

Strength to Weight: Axial

14 points

Strength to Weight: Bending

22 points

Thermal Diffusivity

60 mm2/s

Thermal Shock Resistance

6.1 points

Alloy Composition

Among cast aluminum alloys, the composition of 512.0 aluminum is notable for containing a comparatively high amount of magnesium (Mg) and including chromium (Cr). Magnesium promotes hardenability through both heat treatment and strain hardening mechanisms. It also increases susceptibility to intergranular corrosion. Chromium is used to limit grain growth during hot working or heat treatment, which improves ductility and toughness. Chromium also reduces the alloy's susceptibility to stress corrosion cracking. If the alloy is anodized, the presence of chromium will tend to add a yellow tint to the film.

Aluminum (Al) 90.6 to 95.1
Magnesium (Mg) 3.5 to 4.5
Silicon (Si) 1.4 to 2.2
Manganese (Mn) 0 to 0.8
Iron (Fe) 0 to 0.6
Zinc (Zn) 0 to 0.35
Copper (Cu) 0 to 0.35
Chromium (Cr) 0 to 0.25
Titanium (Ti) 0 to 0.25
Residuals 0 to 0.15

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM B26: Standard Specification for Aluminum-Alloy Sand Castings

Handbook of Aluminum Bonding Technology and Data, J. D. Minford, 1993

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993