Thermal conductivity against densityHigher and further left: spreads more heat for its weightThermal expansion against thermal conductivityLower and further right: warps less when heated
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TIMETAL 6-4 PropertiesTIMETarchived copyTitanium Ti-6Al-4V · Yield strength: typical, plate (>0.187 in), annealed, 0.2% offsetTitanium Ti-6Al-4V · Ultimate tensile strength: typical, plate, annealedTitanium Ti-6Al-4V · Elongation at break: typical, in 2 in., plate annealedTitanium Ti-6Al-4V · Density: nominalTitanium Ti-6Al-4V · Poisson's ratio: mean of TIMET measurementsTitanium Ti-6Al-4V · Melting point: melting rangeTitanium Ti-6Al-4V · Max service temperature: upper recommended use temperature
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TIMETAL 6-4 Data SheetTIMETarchived copyTitanium Ti-6Al-4V · Young's modulus (stiffness): typical range, 20 °CTitanium Ti-6Al-4V · Thermal conductivity: typical, 20 °C, mill annealedTitanium Ti-6Al-4V · Thermal expansion: typical, mean 0-100 °CTitanium Ti-6Al-4V · Specific heat: typical, 20 °C
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MIL-HDBK-5J, Metallic Materials and Elements for Aerospace Vehicle Structures (2003)U.S. Department of DefenseAluminum 7050-T7451 · Poisson's ratio: typical (handbook physical constant)
Each number points to the document that states it, with the exact basis. Values without a number are computed from the sourced ones. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Questions
Mechanical
Is Aluminum 7050-T7451 stronger than Titanium Ti-6Al-4V?
Titanium Ti-6Al-4V 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 Ti-6Al-4V?
Aluminum 7050-T7451 is lighter: 2,830 kg/m³ against 4,430 kg/m³ for Titanium Ti-6Al-4V.
Which is stiffer, Aluminum 7050-T7451 or Titanium Ti-6Al-4V?
Titanium Ti-6Al-4V is stiffer: Young's modulus 115 GPa against 70.3 GPa for Aluminum 7050-T7451, so the same part in Titanium Ti-6Al-4V deflects less under the same load.
Which is lighter for the same job, Aluminum 7050-T7451 or Titanium Ti-6Al-4V?
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 Ti-6Al-4V is lighter for a stiff rod or tie (tension), strong rod or tie.
Part that must be
Aluminum 7050-T7451
Titanium Ti-6Al-4V
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 is more ductile, Aluminum 7050-T7451 or Titanium Ti-6Al-4V?
Titanium Ti-6Al-4V stretches further before it breaks: 16% elongation at break against 11% for Aluminum 7050-T7451.
Thermal
Which conducts heat better, Aluminum 7050-T7451 or Titanium Ti-6Al-4V?
Aluminum 7050-T7451 conducts heat better: 157 W/m·K against 6.6 W/m·K for Titanium Ti-6Al-4V.
Which expands less with temperature?
Titanium Ti-6Al-4V expands less: 9 µm/m·K against 23.5 µm/m·K for Aluminum 7050-T7451.