771.0 Aluminum vs. G-CoCr28 Cobalt
771.0 aluminum belongs to the aluminum alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, 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 G-CoCr28 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 70 | |
| 210 |
| Elongation at Break, % | 1.7 to 6.5 | |
| 6.7 |
| Fatigue Strength, MPa | 92 to 180 | |
| 130 |
| Poisson's Ratio | 0.32 | |
| 0.28 |
| Shear Modulus, GPa | 26 | |
| 83 |
| Tensile Strength: Ultimate (UTS), MPa | 250 to 370 | |
| 560 |
| Tensile Strength: Yield (Proof), MPa | 210 to 350 | |
| 260 |
Thermal Properties
| Latent Heat of Fusion, J/g | 380 | |
| 320 |
| Maximum Temperature: Mechanical, °C | 180 | |
| 1200 |
| Melting Completion (Liquidus), °C | 630 | |
| 1330 |
| Melting Onset (Solidus), °C | 620 | |
| 1270 |
| Specific Heat Capacity, J/kg-K | 870 | |
| 470 |
| Thermal Conductivity, W/m-K | 140 to 150 | |
| 8.5 |
| Thermal Expansion, µm/m-K | 24 | |
| 14 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.5 | |
| 100 |
| Density, g/cm3 | 3.0 | |
| 8.1 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 6.2 |
| Embodied Energy, MJ/kg | 150 | |
| 84 |
| Embodied Water, L/kg | 1130 | |
| 440 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 4.4 to 20 | |
| 31 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 310 to 900 | |
| 160 |
| Stiffness to Weight: Axial, points | 13 | |
| 15 |
| Stiffness to Weight: Bending, points | 46 | |
| 24 |
| Strength to Weight: Axial, points | 23 to 35 | |
| 19 |
| Strength to Weight: Bending, points | 29 to 39 | |
| 19 |
| Thermal Diffusivity, mm2/s | 54 to 58 | |
| 2.2 |
| Thermal Shock Resistance, points | 11 to 16 | |
| 14 |
Alloy Composition
| Aluminum (Al), % | 90.5 to 92.5 | |
| 0 |
| Carbon (C), % | 0 | |
| 0.050 to 0.25 |
| Chromium (Cr), % | 0.060 to 0.2 | |
| 27 to 30 |
| Cobalt (Co), % | 0 | |
| 48 to 52 |
| Copper (Cu), % | 0 to 0.1 | |
| 0 |
| Iron (Fe), % | 0 to 0.15 | |
| 9.7 to 24.5 |
| Magnesium (Mg), % | 0.8 to 1.0 | |
| 0 |
| Manganese (Mn), % | 0 to 0.1 | |
| 0 to 1.5 |
| Molybdenum (Mo), % | 0 | |
| 0 to 0.5 |
| Nickel (Ni), % | 0 | |
| 0 to 4.0 |
| Niobium (Nb), % | 0 | |
| 0 to 0.5 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.15 | |
| 0.5 to 1.5 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0.1 to 0.2 | |
| 0 |
| Zinc (Zn), % | 6.5 to 7.5 | |
| 0 |
| Residuals, % | 0 to 0.15 | |
| 0 |