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.
| Al | 90.8 to 93 | |
| Si | 6.5 to 7.5 | |
| Mg | 0.4 to 0.7 | |
| Ti | 0.040 to 0.2 | |
| Fe | 0 to 0.2 | |
| Cu | 0 to 0.2 | |
| Be | 0.040 to 0.070 | |
| Mn | 0 to 0.1 | |
| Zn | 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
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