MakeItFrom.com
Menu (ESC)

851.0 (A08510, formerly A850.0) Cast Aluminum

851.0 aluminum is an aluminum alloy formulated for casting. 851.0 is the Aluminum Association (AA) designation for this material. A08510 is the UNS number. Older literature may refer to this material as A850.0, but this is now discouraged.

It has a moderately low melting temperature among the ANSI/AA cast aluminums in the database.

The properties of 851.0 aluminum include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare 851.0 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

Elastic (Young's, Tensile) Modulus

69 GPa 10 x 106 psi

Elongation at Break

3.9 to 9.1 %

Poisson's Ratio

0.33

Shear Modulus

26 GPa 3.8 x 106 psi

Tensile Strength: Ultimate (UTS)

130 to 140 MPa 19 to 20 x 103 psi

Thermal Properties

Latent Heat of Fusion

410 J/g

Maximum Temperature: Mechanical

180 °C 350 °F

Melting Completion (Liquidus)

630 °C 1170 °F

Melting Onset (Solidus)

360 °C 680 °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 100 BTU/h-ft-°F

Thermal Expansion

23 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

46 % 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

8.4 kg CO2/kg material

Embodied Energy

160 MJ/kg 67 x 103 BTU/lb

Embodied Water

1140 L/kg 140 gal/lb

Common Calculations

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

45 points

Strength to Weight: Axial

12 to 13 points

Strength to Weight: Bending

19 to 20 points

Thermal Diffusivity

69 mm2/s

Thermal Shock Resistance

6.1 to 6.3 points

Alloy Composition

Among cast aluminum alloys, the composition of 851.0 aluminum is notable for including tin (Sn). Tin is used to increase bearing properties at the cost of a decrease in corrosion resistance.

Aluminum (Al) 86.6 to 91.5
Tin (Sn) 5.5 to 7.0
Silicon (Si) 2.0 to 3.0
Copper (Cu) 0.7 to 1.3
Nickel (Ni) 0.3 to 0.7
Iron (Fe) 0 to 0.7
Titanium (Ti) 0 to 0.2
Manganese (Mn) 0 to 0.1
Magnesium (Mg) 0 to 0.1
Residuals 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 vol. 2: Alloy Production and Materials Manufacturing, George Totten and D. Scott MacKenzie (editors), 2003

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