7021 Aluminum vs. Nickel 725
7021 aluminum belongs to the aluminum alloys classification, while nickel 725 belongs to the nickel alloys. There are 28 material properties with values for both materials. Properties with values for just one material (3, 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 7021 aluminum and the bottom bar is nickel 725.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 69 | |
| 200 |
| Elongation at Break, % | 9.4 | |
| 34 |
| Fatigue Strength, MPa | 150 | |
| 260 |
| Poisson's Ratio | 0.32 | |
| 0.29 |
| Shear Modulus, GPa | 26 | |
| 78 |
| Shear Strength, MPa | 270 | |
| 580 |
| Tensile Strength: Ultimate (UTS), MPa | 460 | |
| 860 |
| 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 | |
| 1340 |
| Melting Onset (Solidus), °C | 510 | |
| 1270 |
| Specific Heat Capacity, J/kg-K | 870 | |
| 440 |
| Thermal Expansion, µm/m-K | 24 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 38 | |
| 1.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 120 | |
| 1.6 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.5 | |
| 75 |
| Density, g/cm3 | 2.9 | |
| 8.5 |
| Embodied Carbon, kg CO2/kg material | 8.3 | |
| 13 |
| Embodied Energy, MJ/kg | 150 | |
| 190 |
| Embodied Water, L/kg | 1140 | |
| 270 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 41 | |
| 240 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1110 | |
| 300 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 47 | |
| 23 |
| Strength to Weight: Axial, points | 44 | |
| 28 |
| Strength to Weight: Bending, points | 45 | |
| 24 |
| Thermal Shock Resistance, points | 20 | |
| 23 |
Alloy Composition
| Aluminum (Al), % | 90.7 to 93.7 | |
| 0 to 0.35 |
| Carbon (C), % | 0 | |
| 0 to 0.030 |
| Chromium (Cr), % | 0 to 0.050 | |
| 19 to 22.5 |
| Copper (Cu), % | 0 to 0.25 | |
| 0 |
| Iron (Fe), % | 0 to 0.4 | |
| 2.3 to 15.3 |
| Magnesium (Mg), % | 1.2 to 1.8 | |
| 0 |
| Manganese (Mn), % | 0 to 0.1 | |
| 0 to 0.35 |
| Molybdenum (Mo), % | 0 | |
| 7.0 to 9.5 |
| Nickel (Ni), % | 0 | |
| 55 to 59 |
| Niobium (Nb), % | 0 | |
| 2.8 to 4.0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 to 0.25 | |
| 0 to 0.2 |
| Sulfur (S), % | 0 | |
| 0 to 0.010 |
| Titanium (Ti), % | 0 to 0.1 | |
| 1.0 to 1.7 |
| Zinc (Zn), % | 5.0 to 6.0 | |
| 0 |
| Zirconium (Zr), % | 0.080 to 0.18 | |
| 0 |
| Residuals, % | 0 to 0.15 | |
| 0 |