Grade 21 Titanium vs. 7475 Aluminum
Grade 21 titanium belongs to the titanium alloys classification, while 7475 aluminum belongs to the aluminum 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.
For each property being compared, the top bar is grade 21 titanium and the bottom bar is 7475 aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 140 | |
| 70 |
| Elongation at Break, % | 9.0 to 17 | |
| 10 to 12 |
| Fatigue Strength, MPa | 550 to 660 | |
| 190 to 210 |
| Poisson's Ratio | 0.32 | |
| 0.32 |
| Shear Modulus, GPa | 51 | |
| 26 |
| Shear Strength, MPa | 550 to 790 | |
| 320 to 350 |
| Tensile Strength: Ultimate (UTS), MPa | 890 to 1340 | |
| 530 to 590 |
| Tensile Strength: Yield (Proof), MPa | 870 to 1170 | |
| 440 to 520 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 380 |
| Maximum Temperature: Mechanical, °C | 310 | |
| 180 |
| Melting Completion (Liquidus), °C | 1740 | |
| 640 |
| Melting Onset (Solidus), °C | 1690 | |
| 480 |
| Specific Heat Capacity, J/kg-K | 500 | |
| 870 |
| Thermal Conductivity, W/m-K | 7.5 | |
| 140 to 160 |
| Thermal Expansion, µm/m-K | 7.1 | |
| 23 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 60 | |
| 10 |
| Density, g/cm3 | 5.4 | |
| 3.0 |
| Embodied Carbon, kg CO2/kg material | 32 | |
| 8.2 |
| Embodied Energy, MJ/kg | 490 | |
| 150 |
| Embodied Water, L/kg | 180 | |
| 1130 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 to 180 | |
| 53 to 68 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 2760 to 5010 | |
| 1390 to 1920 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 32 | |
| 46 |
| Strength to Weight: Axial, points | 46 to 69 | |
| 49 to 55 |
| Strength to Weight: Bending, points | 38 to 50 | |
| 48 to 52 |
| Thermal Diffusivity, mm2/s | 2.8 | |
| 53 to 63 |
| Thermal Shock Resistance, points | 66 to 100 | |
| 23 to 26 |
Alloy Composition
| Aluminum (Al), % | 2.5 to 3.5 | |
| 88.6 to 91.6 |
| Carbon (C), % | 0 to 0.050 | |
| 0 |
| Chromium (Cr), % | 0 | |
| 0.18 to 0.25 |
| Copper (Cu), % | 0 | |
| 1.2 to 1.9 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0 to 0.4 | |
| 0 to 0.12 |
| Magnesium (Mg), % | 0 | |
| 1.9 to 2.6 |
| Manganese (Mn), % | 0 | |
| 0 to 0.060 |
| Molybdenum (Mo), % | 14 to 16 | |
| 0 |
| Niobium (Nb), % | 2.2 to 3.2 | |
| 0 |
| Nitrogen (N), % | 0 to 0.030 | |
| 0 |
| Oxygen (O), % | 0 to 0.17 | |
| 0 |
| Silicon (Si), % | 0.15 to 0.25 | |
| 0 to 0.1 |
| Titanium (Ti), % | 76 to 81.2 | |
| 0 to 0.060 |
| Zinc (Zn), % | 0 | |
| 5.1 to 6.2 |
| Residuals, % | 0 | |
| 0 to 0.15 |