7021 Aluminum vs. Nickel 686
7021 aluminum belongs to the aluminum alloys classification, while nickel 686 belongs to the nickel alloys. 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 7021 aluminum and the bottom bar is nickel 686.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 69 | |
| 220 |
| Elongation at Break, % | 9.4 | |
| 51 |
| Fatigue Strength, MPa | 150 | |
| 410 |
| Poisson's Ratio | 0.32 | |
| 0.29 |
| Shear Modulus, GPa | 26 | |
| 77 |
| Shear Strength, MPa | 270 | |
| 560 |
| Tensile Strength: Ultimate (UTS), MPa | 460 | |
| 780 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 350 |
Thermal Properties
| Latent Heat of Fusion, J/g | 380 | |
| 320 |
| Maximum Temperature: Mechanical, °C | 200 | |
| 980 |
| Melting Completion (Liquidus), °C | 630 | |
| 1380 |
| Melting Onset (Solidus), °C | 510 | |
| 1340 |
| Specific Heat Capacity, J/kg-K | 870 | |
| 420 |
| Thermal Conductivity, W/m-K | 150 | |
| 9.8 |
| Thermal Expansion, µm/m-K | 24 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 38 | |
| 1.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 120 | |
| 1.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.5 | |
| 70 |
| Density, g/cm3 | 2.9 | |
| 9.0 |
| Embodied Carbon, kg CO2/kg material | 8.3 | |
| 12 |
| Embodied Energy, MJ/kg | 150 | |
| 170 |
| Embodied Water, L/kg | 1140 | |
| 300 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 41 | |
| 320 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1110 | |
| 280 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 47 | |
| 22 |
| Strength to Weight: Axial, points | 44 | |
| 24 |
| Strength to Weight: Bending, points | 45 | |
| 21 |
| Thermal Diffusivity, mm2/s | 59 | |
| 2.6 |
| Thermal Shock Resistance, points | 20 | |
| 21 |
Alloy Composition
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| Aluminum (Al), % | 90.7 to 93.7 | |
| 0 |
| Carbon (C), % | 0 | |
| 0 to 0.010 |
| Chromium (Cr), % | 0 to 0.050 | |
| 19 to 23 |
| Copper (Cu), % | 0 to 0.25 | |
| 0 |
| Iron (Fe), % | 0 to 0.4 | |
| 0 to 5.0 |
| Magnesium (Mg), % | 1.2 to 1.8 | |
| 0 |
| Manganese (Mn), % | 0 to 0.1 | |
| 0 to 0.75 |
| Molybdenum (Mo), % | 0 | |
| 15 to 17 |
| Nickel (Ni), % | 0 | |
| 49.5 to 63 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.25 | |
| 0 to 0.080 |
| Sulfur (S), % | 0 | |
| 0 to 0.020 |
| Titanium (Ti), % | 0 to 0.1 | |
| 0.020 to 0.25 |
| Tungsten (W), % | 0 | |
| 3.0 to 4.4 |
| Zinc (Zn), % | 5.0 to 6.0 | |
| 0 |
| Zirconium (Zr), % | 0.080 to 0.18 | |
| 0 |
| Residuals, % | 0 to 0.15 | |
| 0 |