7178 Aluminum vs. C18400 Copper
7178 aluminum belongs to the aluminum alloys classification, while C18400 copper belongs to the copper alloys. There are 29 material properties with values for both materials. Properties with values for just one material (2, 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 7178 aluminum and the bottom bar is C18400 copper.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 71 | |
| 120 |
| Elongation at Break, % | 4.5 to 12 | |
| 13 to 50 |
| Poisson's Ratio | 0.32 | |
| 0.34 |
| Shear Modulus, GPa | 27 | |
| 44 |
| Shear Strength, MPa | 140 to 380 | |
| 190 to 310 |
| Tensile Strength: Ultimate (UTS), MPa | 240 to 640 | |
| 270 to 490 |
| Tensile Strength: Yield (Proof), MPa | 120 to 560 | |
| 110 to 480 |
Thermal Properties
| Latent Heat of Fusion, J/g | 370 | |
| 210 |
| Maximum Temperature: Mechanical, °C | 180 | |
| 200 |
| Melting Completion (Liquidus), °C | 630 | |
| 1080 |
| Melting Onset (Solidus), °C | 480 | |
| 1070 |
| Specific Heat Capacity, J/kg-K | 860 | |
| 390 |
| Thermal Conductivity, W/m-K | 130 | |
| 320 |
| Thermal Expansion, µm/m-K | 23 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 31 | |
| 80 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 91 | |
| 81 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 10 | |
| 31 |
| Density, g/cm3 | 3.1 | |
| 8.9 |
| Embodied Carbon, kg CO2/kg material | 8.2 | |
| 2.6 |
| Embodied Energy, MJ/kg | 150 | |
| 41 |
| Embodied Water, L/kg | 1110 | |
| 310 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 24 to 52 | |
| 63 to 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 110 to 2220 | |
| 54 to 980 |
| Stiffness to Weight: Axial, points | 13 | |
| 7.3 |
| Stiffness to Weight: Bending, points | 45 | |
| 18 |
| Strength to Weight: Axial, points | 21 to 58 | |
| 8.5 to 15 |
| Strength to Weight: Bending, points | 28 to 54 | |
| 10 to 16 |
| Thermal Diffusivity, mm2/s | 47 | |
| 94 |
| Thermal Shock Resistance, points | 10 to 28 | |
| 9.6 to 17 |
Alloy Composition
| Aluminum (Al), % | 85.4 to 89.5 | |
| 0 |
| Arsenic (As), % | 0 | |
| 0 to 0.0050 |
| Calcium (Ca), % | 0 | |
| 0 to 0.0050 |
| Chromium (Cr), % | 0.18 to 0.28 | |
| 0.4 to 1.2 |
| Copper (Cu), % | 1.6 to 2.4 | |
| 97.2 to 99.6 |
| Iron (Fe), % | 0 to 0.5 | |
| 0 to 0.15 |
| Lithium (Li), % | 0 | |
| 0 to 0.050 |
| Magnesium (Mg), % | 2.4 to 3.1 | |
| 0 |
| Manganese (Mn), % | 0 to 0.3 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.050 |
| Silicon (Si), % | 0 to 0.4 | |
| 0 to 0.1 |
| Titanium (Ti), % | 0 to 0.2 | |
| 0 |
| Zinc (Zn), % | 6.3 to 7.3 | |
| 0 to 0.7 |
| Residuals, % | 0 | |
| 0 to 0.5 |