Materials / Compare
Aluminum 7050-T7451 vs. Titanium
Compare Aluminum 7050-T7451 vs. Titanium strength, stiffness, weight and thermal properties.
| Try it on a partA bracket to run stress or thermal on, free in your browser | Open in LessCAD | Open in LessCAD |
|---|---|---|
| Mechanical | ||
| Yield strength | 469MPasourcetypical, longitudinal, 0.2% offset | 885MPasourcetypical, plate (>0.187 in), annealed, 0.2% offset |
| Ultimate tensile strength | 524MPasourcetypical, longitudinal | 940MPasourcetypical, plate, annealed |
| Elongation at break | 11%sourcetypical, longitudinal | 16%sourcetypical, in 2 in., plate annealed |
| Young's modulus (stiffness) | 70.3GPasourcetypical | 107–122GPasourcetypical range, 20 °C |
| Density | 2,830kg/m³sourcenominal1.57x lighter | 4,430kg/m³sourcenominal |
| Strength to weight | 166kN·m/kg | 200kN·m/kg21% higher |
| Stiffness to weight | 24.8MN·m/kg | 25.8MN·m/kg4% higher |
| Poisson's ratio | 0.33sourcetypical (handbook physical constant) | 0.342sourcemean of TIMET measurements |
| Shear modulus | 26.4GPa | 42.7GPa1.61x stiffer in shear |
| Bulk modulus | 68.9GPa | 121GPa |
| Speed of sound | 4,984m/s | 5,084m/s |
| Thermal | ||
| Thermal conductivity | 157W/m·Ksourcetypical, 20 °C | 6.6W/m·Ksourcetypical, 20 °C, mill annealed |
| Thermal expansion | 23.5µm/m·Ksourcetypical, mean 20-100 °C | 9µm/m·Ksourcetypical, mean 0-100 °C |
| 100 mm part over a 50 °C swing | 118µm growth | 45µm growth2.61x less |
| Specific heat | 860J/kg·Ksourcetypical, at 100 °C | 580J/kg·Ksourcetypical, 20 °C |
| Heats up and cools (diffusivity) | 64.5mm²/s25.1x faster | 2.57mm²/s |
| Thermal shock resistance | 29,862W/m8.01x more resistant | 3,730W/m |
| Melting point | 524–635°Csourcemelting range | 1,630–1,650°Csourcemelting range |
| Max service temperature | not sourced | 400°Csourceupper recommended use temperature |
| Values for | 7050-T7451 plate, Kaiser Aluminum sheet, coil & plate typical datasheet (longitudinal); Poisson from MIL-HDBK-5J | TIMETAL 6-4 (Ti-6Al-4V Grade 5) annealed plate typical (TIMET properties manual) + TIMET datasheet TMC-0150 physical properties |
Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Questions
Is Aluminum 7050-T7451 stronger than Titanium?
Titanium is stronger: its yield strength is 885 MPa against 469 MPa for Aluminum 7050-T7451 (1.89x).
Which is lighter, Aluminum 7050-T7451 or Titanium?
Aluminum 7050-T7451 is lighter: 2,830 kg/m³ against 4,430 kg/m³ for Titanium.
Which is stiffer, Aluminum 7050-T7451 or Titanium?
Titanium is stiffer: Young's modulus 115 GPa against 70.3 GPa for Aluminum 7050-T7451, so the same part in Titanium deflects less under the same load.
Which is lighter for the same job, Aluminum 7050-T7451 or Titanium?
For the same stiffness or strength: Aluminum 7050-T7451 is lighter for a stiff beam (bending), stiff panel or plate, strong beam, strong panel or plate; Titanium is lighter for a stiff rod or tie (tension), strong rod or tie.
| Part that must be | Aluminum 7050-T7451 | Titanium |
|---|---|---|
| Stiff rod or tie (tension) | 4% heavier | lighter |
| Stiff beam (bending) | lighter | 23% heavier |
| Stiff panel or plate | lighter | 33% heavier |
| Strong rod or tie | 21% heavier | lighter |
| Strong beam | lighter | 3% heavier |
| Strong panel or plate | lighter | 14% heavier |
For the same stiffness or strength, mass scales with density over stiffness (or strength) raised to a power set by how the part is loaded: 1 for a rod in tension, 1/2 for a beam in bending, 1/3 for a panel (the standard material-selection indices).
Which conducts heat better, Aluminum 7050-T7451 or Titanium?
Aluminum 7050-T7451 conducts heat better: 157 W/m·K against 6.6 W/m·K for Titanium.
Which expands less with temperature?
Titanium expands less: 9 µm/m·K against 23.5 µm/m·K for Aluminum 7050-T7451.