771.0 Aluminum vs. R31539 Cobalt
771.0 aluminum belongs to the aluminum alloys classification, while R31539 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.
For each property being compared, the top bar is 771.0 aluminum and the bottom bar is R31539 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 70 | |
| 220 |
| Elongation at Break, % | 1.7 to 6.5 | |
| 13 to 22 |
| Fatigue Strength, MPa | 92 to 180 | |
| 310 to 480 |
| Poisson's Ratio | 0.32 | |
| 0.29 |
| Shear Modulus, GPa | 26 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 250 to 370 | |
| 1000 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 210 to 350 | |
| 590 to 940 |
Thermal Properties
| Latent Heat of Fusion, J/g | 380 | |
| 320 |
| Melting Completion (Liquidus), °C | 630 | |
| 1360 |
| Melting Onset (Solidus), °C | 620 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 870 | |
| 450 |
| Thermal Conductivity, W/m-K | 140 to 150 | |
| 13 |
| Thermal Expansion, µm/m-K | 24 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 27 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 82 | |
| 2.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 3.0 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 8.2 |
| Embodied Energy, MJ/kg | 150 | |
| 110 |
| Embodied Water, L/kg | 1130 | |
| 530 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 4.4 to 20 | |
| 140 to 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 310 to 900 | |
| 780 to 2000 |
| Stiffness to Weight: Axial, points | 13 | |
| 15 |
| Stiffness to Weight: Bending, points | 46 | |
| 24 |
| Strength to Weight: Axial, points | 23 to 35 | |
| 33 to 44 |
| Strength to Weight: Bending, points | 29 to 39 | |
| 27 to 32 |
| Thermal Diffusivity, mm2/s | 54 to 58 | |
| 3.5 |
| Thermal Shock Resistance, points | 11 to 16 | |
| 24 to 32 |
Alloy Composition
| Aluminum (Al), % | 90.5 to 92.5 | |
| 0.3 to 1.0 |
| Carbon (C), % | 0 | |
| 0 to 0.14 |
| Chromium (Cr), % | 0.060 to 0.2 | |
| 26 to 30 |
| Cobalt (Co), % | 0 | |
| 57.7 to 68.7 |
| Copper (Cu), % | 0 to 0.1 | |
| 0 |
| Iron (Fe), % | 0 to 0.15 | |
| 0 to 0.75 |
| Lanthanum (La), % | 0 | |
| 0.030 to 0.2 |
| Magnesium (Mg), % | 0.8 to 1.0 | |
| 0 |
| Manganese (Mn), % | 0 to 0.1 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 5.0 to 7.0 |
| Nickel (Ni), % | 0 | |
| 0 to 1.0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.25 |
| Silicon (Si), % | 0 to 0.15 | |
| 0 to 1.0 |
| Titanium (Ti), % | 0.1 to 0.2 | |
| 0 |
| Zinc (Zn), % | 6.5 to 7.5 | |
| 0 |
| Residuals, % | 0 to 0.15 | |
| 0 |