851.0-T6 Cast Aluminum
851.0-T6 aluminum is 851.0 aluminum in the T6 temper. To achieve this temper, the metal is solution heat-treated and artificially aged until it meets standard mechanical property requirements. The graph bars on the material properties cards below compare 851.0-T6 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
9.1 %
Poisson's Ratio
0.33
Shear Modulus
26 GPa 3.8 x 106 psi
Tensile Strength: Ultimate (UTS)
140 MPa 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
13 points
Strength to Weight: Bending
20 points
Thermal Diffusivity
69 mm2/s
Thermal Shock Resistance
6.3 points
Alloy Composition
| Al | 86.6 to 91.5 | |
| Sn | 5.5 to 7.0 | |
| Si | 2.0 to 3.0 | |
| Cu | 0.7 to 1.3 | |
| Ni | 0.3 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
Further Reading
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