355.0 Aluminum vs. Grade 21 Titanium
355.0 aluminum belongs to the aluminum alloys classification, while grade 21 titanium belongs to the titanium alloys. There are 28 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is 355.0 aluminum and the bottom bar is grade 21 titanium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 71 | |
| 140 |
| Elongation at Break, % | 1.5 to 2.6 | |
| 9.0 to 17 |
| Fatigue Strength, MPa | 55 to 70 | |
| 550 to 660 |
| Poisson's Ratio | 0.33 | |
| 0.32 |
| Shear Modulus, GPa | 27 | |
| 51 |
| Shear Strength, MPa | 150 to 240 | |
| 550 to 790 |
| Tensile Strength: Ultimate (UTS), MPa | 200 to 260 | |
| 890 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 150 to 190 | |
| 870 to 1170 |
Thermal Properties
| Latent Heat of Fusion, J/g | 470 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 180 | |
| 310 |
| Melting Completion (Liquidus), °C | 620 | |
| 1740 |
| Melting Onset (Solidus), °C | 560 | |
| 1690 |
| Specific Heat Capacity, J/kg-K | 890 | |
| 500 |
| Thermal Conductivity, W/m-K | 150 to 170 | |
| 7.5 |
| Thermal Expansion, µm/m-K | 22 | |
| 7.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.5 | |
| 60 |
| Density, g/cm3 | 2.7 | |
| 5.4 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 32 |
| Embodied Energy, MJ/kg | 150 | |
| 490 |
| Embodied Water, L/kg | 1120 | |
| 180 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 2.7 to 5.9 | |
| 110 to 180 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 150 to 250 | |
| 2760 to 5010 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 51 | |
| 32 |
| Strength to Weight: Axial, points | 20 to 27 | |
| 46 to 69 |
| Strength to Weight: Bending, points | 28 to 33 | |
| 38 to 50 |
| Thermal Diffusivity, mm2/s | 60 to 69 | |
| 2.8 |
| Thermal Shock Resistance, points | 9.1 to 12 | |
| 66 to 100 |
Alloy Composition
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| Aluminum (Al), % | 90.3 to 94.1 | |
| 2.5 to 3.5 |
| Carbon (C), % | 0 | |
| 0 to 0.050 |
| Chromium (Cr), % | 0 to 0.25 | |
| 0 |
| Copper (Cu), % | 1.0 to 1.5 | |
| 0 |
| Hydrogen (H), % | 0 | |
| 0 to 0.015 |
| Iron (Fe), % | 0 to 0.6 | |
| 0 to 0.4 |
| Magnesium (Mg), % | 0.4 to 0.6 | |
| 0 |
| Manganese (Mn), % | 0 to 0.5 | |
| 0 |
| Molybdenum (Mo), % | 0 | |
| 14 to 16 |
| Niobium (Nb), % | 0 | |
| 2.2 to 3.2 |
| Nitrogen (N), % | 0 | |
| 0 to 0.030 |
| Oxygen (O), % | 0 | |
| 0 to 0.17 |
| Silicon (Si), % | 4.5 to 5.5 | |
| 0.15 to 0.25 |
| Titanium (Ti), % | 0 to 0.25 | |
| 76 to 81.2 |
| Zinc (Zn), % | 0 to 0.35 | |
| 0 |
| Residuals, % | 0 to 0.15 | |
| 0 to 0.4 |