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A357.0 (A357.0-T61, A13570) Cast Aluminum

A357.0 aluminum is an aluminum alloy formulated for casting. Cited properties are appropriate for the T61 temper. To achieve this temper, the metal is solution heat-treated and artificially underaged. The degree of underaging is different from T64 and T65. A357.0 is the Aluminum Association (AA) designation for this material. A13570 is the UNS number.

The graph bars on the material properties cards below compare A357.0 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

100

Elastic (Young's, Tensile) Modulus

70 GPa 10 x 106 psi

Elongation at Break

3.7 %

Fatigue Strength

100 MPa 15 x 103 psi

Poisson's Ratio

0.33

Shear Modulus

26 GPa 3.8 x 106 psi

Shear Strength

240 MPa 35 x 103 psi

Tensile Strength: Ultimate (UTS)

350 MPa 51 x 103 psi

Tensile Strength: Yield (Proof)

270 MPa 39 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)

560 °C 1050 °F

Specific Heat Capacity

900 J/kg-K 0.22 BTU/lb-°F

Thermal Conductivity

160 W/m-K 92 BTU/h-ft-°F

Thermal Expansion

21 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

40 % IACS

Electrical Conductivity: Equal Weight (Specific)

140 % IACS

Otherwise Unclassified Properties

Base Metal Price

12 % relative

Density

2.6 g/cm3 160 lb/ft3

Embodied Carbon

8.2 kg CO2/kg material

Embodied Energy

150 MJ/kg 65 x 103 BTU/lb

Embodied Water

1110 L/kg 130 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

12 MJ/m3

Resilience: Unit (Modulus of Resilience)

520 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

53 points

Strength to Weight: Axial

38 points

Strength to Weight: Bending

43 points

Thermal Diffusivity

68 mm2/s

Thermal Shock Resistance

17 points

Alloy Composition

Among cast aluminum alloys, the composition of A357.0 aluminum is notable for including beryllium (Be). Beryllium is used to reduce oxidation at elevated temperatures, at the cost of substantial toxicity.

Aluminum (Al) 90.8 to 93
Silicon (Si) 6.5 to 7.5
Magnesium (Mg) 0.4 to 0.7
Titanium (Ti) 0.040 to 0.2
Iron (Fe) 0 to 0.2
Copper (Cu) 0 to 0.2
Beryllium (Be) 0.040 to 0.070
Manganese (Mn) 0 to 0.1
Zinc (Zn) 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

ASTM B686: Standard Specification for Aluminum Alloy Castings, High-Strength

ASTM B108: Standard Specification for Aluminum-Alloy Permanent Mold Castings

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

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