Nickel 718 vs. 2218 Aluminum
Nickel 718 belongs to the nickel alloys classification, while 2218 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (5, 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 nickel 718 and the bottom bar is 2218 aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 73 |
| Elongation at Break, % | 12 to 50 | |
| 6.8 to 10 |
| Fatigue Strength, MPa | 460 to 760 | |
| 110 |
| Poisson's Ratio | 0.29 | |
| 0.33 |
| Shear Modulus, GPa | 75 | |
| 27 |
| Shear Strength, MPa | 660 to 950 | |
| 210 to 250 |
| Tensile Strength: Ultimate (UTS), MPa | 930 to 1530 | |
| 330 to 430 |
| Tensile Strength: Yield (Proof), MPa | 510 to 1330 | |
| 260 to 310 |
Thermal Properties
| Latent Heat of Fusion, J/g | 310 | |
| 390 |
| Maximum Temperature: Mechanical, °C | 980 | |
| 220 |
| Melting Completion (Liquidus), °C | 1340 | |
| 640 |
| Melting Onset (Solidus), °C | 1260 | |
| 510 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 870 |
| Thermal Conductivity, W/m-K | 11 | |
| 140 |
| Thermal Expansion, µm/m-K | 13 | |
| 22 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.4 | |
| 37 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 1.5 | |
| 110 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 75 | |
| 11 |
| Density, g/cm3 | 8.3 | |
| 3.1 |
| Embodied Carbon, kg CO2/kg material | 13 | |
| 8.2 |
| Embodied Energy, MJ/kg | 190 | |
| 150 |
| Embodied Water, L/kg | 250 | |
| 1130 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 390 | |
| 27 to 31 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 660 to 4560 | |
| 450 to 650 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 23 | |
| 45 |
| Strength to Weight: Axial, points | 31 to 51 | |
| 30 to 39 |
| Strength to Weight: Bending, points | 25 to 35 | |
| 34 to 41 |
| Thermal Diffusivity, mm2/s | 3.0 | |
| 52 |
| Thermal Shock Resistance, points | 27 to 44 | |
| 15 to 19 |
Alloy Composition
| Aluminum (Al), % | 0.2 to 0.8 | |
| 88.8 to 93.6 |
| Boron (B), % | 0 to 0.0060 | |
| 0 |
| Carbon (C), % | 0 to 0.080 | |
| 0 |
| Chromium (Cr), % | 17 to 21 | |
| 0 to 0.1 |
| Cobalt (Co), % | 0 to 1.0 | |
| 0 |
| Copper (Cu), % | 0 to 0.3 | |
| 3.5 to 4.5 |
| Iron (Fe), % | 11.1 to 24.6 | |
| 0 to 1.0 |
| Magnesium (Mg), % | 0 | |
| 1.2 to 1.8 |
| Manganese (Mn), % | 0 to 0.35 | |
| 0 to 0.2 |
| Molybdenum (Mo), % | 2.8 to 3.3 | |
| 0 |
| Nickel (Ni), % | 50 to 55 | |
| 1.7 to 2.3 |
| Niobium (Nb), % | 4.8 to 5.5 | |
| 0 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 |
| Silicon (Si), % | 0 to 0.35 | |
| 0 to 0.9 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 |
| Titanium (Ti), % | 0.65 to 1.2 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 0 to 0.25 |
| Residuals, % | 0 | |
| 0 to 0.15 |