EN AC-42100 Aluminum vs. Grade 21 Titanium
EN AC-42100 aluminum belongs to the aluminum alloys classification, while grade 21 titanium belongs to the titanium alloys. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.
For each property being compared, the top bar is EN AC-42100 aluminum and the bottom bar is grade 21 titanium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 70 | |
| 140 |
| Elongation at Break, % | 3.4 to 9.0 | |
| 9.0 to 17 |
| Fatigue Strength, MPa | 76 to 82 | |
| 550 to 660 |
| Poisson's Ratio | 0.33 | |
| 0.32 |
| Shear Modulus, GPa | 26 | |
| 51 |
| Tensile Strength: Ultimate (UTS), MPa | 280 to 290 | |
| 890 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 210 to 230 | |
| 870 to 1170 |
Thermal Properties
| Latent Heat of Fusion, J/g | 500 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 170 | |
| 310 |
| Melting Completion (Liquidus), °C | 610 | |
| 1740 |
| Melting Onset (Solidus), °C | 600 | |
| 1690 |
| Specific Heat Capacity, J/kg-K | 910 | |
| 500 |
| Thermal Conductivity, W/m-K | 150 | |
| 7.5 |
| Thermal Expansion, µm/m-K | 22 | |
| 7.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.5 | |
| 60 |
| Density, g/cm3 | 2.6 | |
| 5.4 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 32 |
| Embodied Energy, MJ/kg | 150 | |
| 490 |
| Embodied Water, L/kg | 1110 | |
| 180 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 9.1 to 23 | |
| 110 to 180 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 300 to 370 | |
| 2760 to 5010 |
| Stiffness to Weight: Axial, points | 15 | |
| 14 |
| Stiffness to Weight: Bending, points | 53 | |
| 32 |
| Strength to Weight: Axial, points | 30 to 31 | |
| 46 to 69 |
| Strength to Weight: Bending, points | 37 to 38 | |
| 38 to 50 |
| Thermal Diffusivity, mm2/s | 66 | |
| 2.8 |
| Thermal Shock Resistance, points | 13 | |
| 66 to 100 |
Alloy Composition
| Aluminum (Al), % | 91.3 to 93.3 | |
| 2.5 to 3.5 |
| Carbon (C), % | 0 | |
| 0 to 0.050 |
| Copper (Cu), % | 0 to 0.050 | |
| 0 |
| Hydrogen (H), % | 0 | |
| 0 to 0.015 |
| Iron (Fe), % | 0 to 0.19 | |
| 0 to 0.4 |
| Magnesium (Mg), % | 0.25 to 0.45 | |
| 0 |
| Manganese (Mn), % | 0 to 0.1 | |
| 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), % | 6.5 to 7.5 | |
| 0.15 to 0.25 |
| Titanium (Ti), % | 0 to 0.25 | |
| 76 to 81.2 |
| Zinc (Zn), % | 0 to 0.070 | |
| 0 |
| Residuals, % | 0 | |
| 0 to 0.4 |