2018 Aluminum vs. 2618 Aluminum
Both 2018 aluminum and 2618 aluminum are aluminum alloys. Both are furnished in the T61 temper. They have a very high 97% of their average alloy composition in common.
For each property being compared, the top bar is 2018 aluminum and the bottom bar is 2618 aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 120 | |
| 120 |
| Elastic (Young's, Tensile) Modulus, GPa | 73 | |
| 71 |
| Elongation at Break, % | 9.6 | |
| 5.8 |
| Fatigue Strength, MPa | 120 | |
| 110 |
| Poisson's Ratio | 0.33 | |
| 0.33 |
| Shear Modulus, GPa | 27 | |
| 27 |
| Shear Strength, MPa | 270 | |
| 260 |
| Tensile Strength: Ultimate (UTS), MPa | 420 | |
| 420 |
| Tensile Strength: Yield (Proof), MPa | 310 | |
| 350 |
Thermal Properties
| Latent Heat of Fusion, J/g | 390 | |
| 390 |
| Maximum Temperature: Mechanical, °C | 220 | |
| 210 |
| Melting Completion (Liquidus), °C | 640 | |
| 640 |
| Melting Onset (Solidus), °C | 510 | |
| 550 |
| Specific Heat Capacity, J/kg-K | 870 | |
| 880 |
| Thermal Conductivity, W/m-K | 150 | |
| 160 |
| Thermal Expansion, µm/m-K | 22 | |
| 22 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 40 | |
| 37 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 120 | |
| 110 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 11 | |
| 11 |
| Density, g/cm3 | 3.1 | |
| 2.9 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 8.3 |
| Embodied Energy, MJ/kg | 150 | |
| 150 |
| Embodied Water, L/kg | 1130 | |
| 1150 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 37 | |
| 23 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 670 | |
| 850 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 45 | |
| 47 |
| Strength to Weight: Axial, points | 38 | |
| 40 |
| Strength to Weight: Bending, points | 41 | |
| 42 |
| Thermal Diffusivity, mm2/s | 57 | |
| 62 |
| Thermal Shock Resistance, points | 19 | |
| 19 |
Alloy Composition
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| Aluminum (Al), % | 89.7 to 94.4 | |
| 92.4 to 94.9 |
| Chromium (Cr), % | 0 to 0.1 | |
| 0 |
| Copper (Cu), % | 3.5 to 4.5 | |
| 1.9 to 2.7 |
| Iron (Fe), % | 0 to 1.0 | |
| 0.9 to 1.3 |
| Magnesium (Mg), % | 0.45 to 0.9 | |
| 1.3 to 1.8 |
| Manganese (Mn), % | 0 to 0.2 | |
| 0 |
| Nickel (Ni), % | 1.7 to 2.3 | |
| 0.9 to 1.2 |
| Silicon (Si), % | 0 to 0.9 | |
| 0.1 to 0.25 |
| Titanium (Ti), % | 0 | |
| 0.040 to 0.1 |
| Zinc (Zn), % | 0 to 0.25 | |
| 0 to 0.1 |
| Residuals, % | 0 to 0.15 | |
| 0 to 0.15 |