850.0 (850.0-T5, A08500, formerly 750.0) Cast Aluminum
850.0 aluminum is an aluminum alloy formulated for casting. Cited properties are appropriate for the T5 temper. To achieve this temper, the metal is artificially aged until it meets standard mechanical property requirements. 850.0 is the Aluminum Association (AA) designation for this material. A08500 is the UNS number. Older literature may refer to this material as 750.0, but this is now discouraged.
It has the highest electrical conductivity among the ANSI/AA cast aluminums in the database.
The graph bars on the material properties cards below compare 850.0 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
45
Elastic (Young's, Tensile) Modulus
69 GPa 10 x 106 psi
Elongation at Break
7.9 %
Fatigue Strength
59 MPa 8.5 x 103 psi
Poisson's Ratio
0.33
Shear Modulus
26 GPa 3.8 x 106 psi
Shear Strength
100 MPa 14 x 103 psi
Tensile Strength: Ultimate (UTS)
140 MPa 20 x 103 psi
Tensile Strength: Yield (Proof)
76 MPa 11 x 103 psi
Thermal Properties
Latent Heat of Fusion
380 J/g
Maximum Temperature: Mechanical
190 °C 370 °F
Melting Completion (Liquidus)
650 °C 1200 °F
Melting Onset (Solidus)
370 °C 690 °F
Solidification (Pattern Maker's) Shrinkage
1.3 %
Specific Heat Capacity
850 J/kg-K 0.2 BTU/lb-°F
Thermal Conductivity
180 W/m-K 110 BTU/h-ft-°F
Thermal Expansion
23 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
47 % IACS
Electrical Conductivity: Equal Weight (Specific)
140 % IACS
Otherwise Unclassified Properties
Base Metal Price
14 % relative
Density
3.1 g/cm3 190 lb/ft3
Embodied Carbon
8.5 kg CO2/kg material
Embodied Energy
160 MJ/kg 67 x 103 BTU/lb
Embodied Water
1160 L/kg 140 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
9.1 MJ/m3
Resilience: Unit (Modulus of Resilience)
42 kJ/m3
Stiffness to Weight: Axial
12 points
Stiffness to Weight: Bending
44 points
Strength to Weight: Axial
12 points
Strength to Weight: Bending
19 points
Thermal Diffusivity
69 mm2/s
Thermal Shock Resistance
6.1 points
Alloy Composition
Among cast aluminum alloys, the composition of 850.0 aluminum is notable for including tin (Sn). Tin is used to increase bearing properties at the cost of a decrease in corrosion resistance.
| Al | 88.3 to 93.1 | |
| Sn | 5.5 to 7.0 | |
| Ni | 0.7 to 1.3 | |
| Cu | 0.7 to 1.3 | |
| Si | 0 to 0.7 | |
| Fe | 0 to 0.7 | |
| Ti | 0 to 0.2 | |
| Mn | 0 to 0.1 | |
| Mg | 0 to 0.1 | |
| res. | 0 to 0.3 |
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 B108: Standard Specification for Aluminum-Alloy Permanent Mold Castings
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