Grade 18 Titanium vs. 6018 Aluminum
Grade 18 titanium belongs to the titanium alloys classification, while 6018 aluminum belongs to the aluminum 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.
For each property being compared, the top bar is grade 18 titanium and the bottom bar is 6018 aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 110 | |
| 69 |
| Elongation at Break, % | 11 to 17 | |
| 9.0 to 9.1 |
| Fatigue Strength, MPa | 330 to 480 | |
| 85 to 89 |
| Poisson's Ratio | 0.32 | |
| 0.33 |
| Shear Modulus, GPa | 40 | |
| 26 |
| Shear Strength, MPa | 420 to 590 | |
| 170 to 180 |
| Tensile Strength: Ultimate (UTS), MPa | 690 to 980 | |
| 290 to 300 |
| Tensile Strength: Yield (Proof), MPa | 540 to 810 | |
| 220 to 230 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 400 |
| Maximum Temperature: Mechanical, °C | 330 | |
| 160 |
| Melting Completion (Liquidus), °C | 1640 | |
| 640 |
| Melting Onset (Solidus), °C | 1590 | |
| 570 |
| Specific Heat Capacity, J/kg-K | 550 | |
| 890 |
| Thermal Conductivity, W/m-K | 8.3 | |
| 170 |
| Thermal Expansion, µm/m-K | 9.9 | |
| 23 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.3 | |
| 44 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.7 | |
| 140 |
Otherwise Unclassified Properties
| Density, g/cm3 | 4.5 | |
| 2.9 |
| Embodied Carbon, kg CO2/kg material | 41 | |
| 8.2 |
| Embodied Energy, MJ/kg | 670 | |
| 150 |
| Embodied Water, L/kg | 270 | |
| 1180 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 87 to 110 | |
| 24 to 25 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1380 to 3110 | |
| 360 to 380 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 35 | |
| 48 |
| Strength to Weight: Axial, points | 43 to 61 | |
| 28 to 29 |
| Strength to Weight: Bending, points | 39 to 49 | |
| 34 to 35 |
| Thermal Diffusivity, mm2/s | 3.4 | |
| 65 |
| Thermal Shock Resistance, points | 47 to 67 | |
| 13 |
Alloy Composition
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| Aluminum (Al), % | 2.5 to 3.5 | |
| 93.1 to 97.8 |
| Bismuth (Bi), % | 0 | |
| 0.4 to 0.7 |
| Carbon (C), % | 0 to 0.080 | |
| 0 |
| Chromium (Cr), % | 0 | |
| 0 to 0.1 |
| Copper (Cu), % | 0 | |
| 0.15 to 0.4 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0 to 0.25 | |
| 0 to 0.7 |
| Lead (Pb), % | 0 | |
| 0.4 to 1.2 |
| Magnesium (Mg), % | 0 | |
| 0.6 to 1.2 |
| Manganese (Mn), % | 0 | |
| 0.3 to 0.8 |
| Nitrogen (N), % | 0 to 0.030 | |
| 0 |
| Oxygen (O), % | 0 to 0.15 | |
| 0 |
| Palladium (Pd), % | 0.040 to 0.080 | |
| 0 |
| Silicon (Si), % | 0 | |
| 0.5 to 1.2 |
| Titanium (Ti), % | 92.5 to 95.5 | |
| 0 to 0.2 |
| Vanadium (V), % | 2.0 to 3.0 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 0 to 0.3 |
| Residuals, % | 0 to 0.4 | |
| 0 to 0.15 |