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712.0 (ZG61A, A07120) Cast Aluminum

712.0 aluminum is an aluminum alloy formulated for casting. 712.0 is the Aluminum Association (AA) designation for this material. A07120 is the UNS number. Additionally, the SAE designation is 310. And the British Standard (BS) designation is LM31. Older literature may refer to this material as ASTM ZG61A or D712.0.

The properties of 712.0 aluminum include three common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare 712.0 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

75 to 90

Elastic (Young's, Tensile) Modulus

70 GPa 10 x 106 psi

Elongation at Break

4.5 to 4.7 %

Fatigue Strength

140 to 180 MPa 20 to 26 x 103 psi

Poisson's Ratio

0.32

Shear Modulus

27 GPa 3.8 x 106 psi

Shear Strength

180 MPa 26 x 103 psi

Tensile Strength: Ultimate (UTS)

250 to 260 MPa 36 to 38 x 103 psi

Tensile Strength: Yield (Proof)

180 to 200 MPa 27 to 28 x 103 psi

Thermal Properties

Latent Heat of Fusion

380 J/g

Maximum Temperature: Mechanical

190 °C 370 °F

Melting Completion (Liquidus)

640 °C 1180 °F

Melting Onset (Solidus)

610 °C 1120 °F

Solidification (Pattern Maker's) Shrinkage

1.6 %

Specific Heat Capacity

870 J/kg-K 0.21 BTU/lb-°F

Thermal Conductivity

160 W/m-K 92 BTU/h-ft-°F

Thermal Expansion

24 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

40 % IACS

Electrical Conductivity: Equal Weight (Specific)

120 % IACS

Otherwise Unclassified Properties

Base Metal Price

9.5 % relative

Density

3.0 g/cm3 180 lb/ft3

Embodied Carbon

8.0 kg CO2/kg material

Embodied Energy

150 MJ/kg 64 x 103 BTU/lb

Embodied Water

1140 L/kg 140 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

11 MJ/m3

Resilience: Unit (Modulus of Resilience)

240 to 270 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

46 points

Strength to Weight: Axial

24 to 25 points

Strength to Weight: Bending

30 to 31 points

Thermal Diffusivity

62 mm2/s

Thermal Shock Resistance

11 points

Alloy Composition

Among cast aluminum alloys, the composition of 712.0 aluminum is notable for containing a comparatively high amount of zinc (Zn) and including chromium (Cr). 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. 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) 90.7 to 94
Zinc (Zn) 5.0 to 6.5
Magnesium (Mg) 0.5 to 0.65
Chromium (Cr) 0.4 to 0.6
Iron (Fe) 0 to 0.5
Titanium (Ti) 0.15 to 0.25
Silicon (Si) 0 to 0.3
Copper (Cu) 0 to 0.25
Manganese (Mn) 0 to 0.1
Residuals 0 to 0.2

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

Followup Questions

Similar Alloys

Further Reading

ASTM B618: Standard Specification for Aluminum-Alloy Investment Castings

ASTM B26: Standard Specification for Aluminum-Alloy Sand Castings

Aluminum: Properties and Physical Metallurgy, John E. Hatch (editor), 1984

ASM Specialty Handbook: Aluminum and Aluminum Alloys, J. R. Davis (editor), 1993