Grade 20 Titanium vs. 7178 Aluminum
Grade 20 titanium belongs to the titanium alloys classification, while 7178 aluminum belongs to the aluminum alloys. There are 25 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is grade 20 titanium and the bottom bar is 7178 aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 120 | |
| 71 |
| Elongation at Break, % | 5.7 to 17 | |
| 4.5 to 12 |
| Fatigue Strength, MPa | 550 to 630 | |
| 120 to 210 |
| Poisson's Ratio | 0.32 | |
| 0.32 |
| Shear Modulus, GPa | 47 | |
| 27 |
| Shear Strength, MPa | 560 to 740 | |
| 140 to 380 |
| Tensile Strength: Ultimate (UTS), MPa | 900 to 1270 | |
| 240 to 640 |
| Tensile Strength: Yield (Proof), MPa | 850 to 1190 | |
| 120 to 560 |
Thermal Properties
| Latent Heat of Fusion, J/g | 400 | |
| 370 |
| Maximum Temperature: Mechanical, °C | 370 | |
| 180 |
| Melting Completion (Liquidus), °C | 1660 | |
| 630 |
| Melting Onset (Solidus), °C | 1600 | |
| 480 |
| Specific Heat Capacity, J/kg-K | 520 | |
| 860 |
| Thermal Expansion, µm/m-K | 9.6 | |
| 23 |
Otherwise Unclassified Properties
| Density, g/cm3 | 5.0 | |
| 3.1 |
| Embodied Carbon, kg CO2/kg material | 52 | |
| 8.2 |
| Embodied Energy, MJ/kg | 860 | |
| 150 |
| Embodied Water, L/kg | 350 | |
| 1110 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 71 to 150 | |
| 24 to 52 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 2940 to 5760 | |
| 110 to 2220 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 33 | |
| 45 |
| Strength to Weight: Axial, points | 50 to 70 | |
| 21 to 58 |
| Strength to Weight: Bending, points | 41 to 52 | |
| 28 to 54 |
| Thermal Shock Resistance, points | 55 to 77 | |
| 10 to 28 |
Alloy Composition
| Aluminum (Al), % | 3.0 to 4.0 | |
| 85.4 to 89.5 |
| Carbon (C), % | 0 to 0.050 | |
| 0 |
| Chromium (Cr), % | 5.5 to 6.5 | |
| 0.18 to 0.28 |
| Copper (Cu), % | 0 | |
| 1.6 to 2.4 |
| Hydrogen (H), % | 0 to 0.020 | |
| 0 |
| Iron (Fe), % | 0 to 0.3 | |
| 0 to 0.5 |
| Magnesium (Mg), % | 0 | |
| 2.4 to 3.1 |
| Manganese (Mn), % | 0 | |
| 0 to 0.3 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 0 |
| Nitrogen (N), % | 0 to 0.030 | |
| 0 |
| Oxygen (O), % | 0 to 0.12 | |
| 0 |
| Palladium (Pd), % | 0.040 to 0.080 | |
| 0 |
| Silicon (Si), % | 0 | |
| 0 to 0.4 |
| Titanium (Ti), % | 71 to 77 | |
| 0 to 0.2 |
| Vanadium (V), % | 7.5 to 8.5 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 6.3 to 7.3 |
| Zirconium (Zr), % | 3.5 to 4.5 | |
| 0 |
| Residuals, % | 0 | |
| 0 to 0.15 |