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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Alloy 7075 Rod & Bar Technical DataKaiser Aluminumarchived copyAluminum 7075-T6 · Yield strength: typical, 0.2% offset, .500 in dia specimenAluminum 7075-T6 · Ultimate tensile strength: typicalAluminum 7075-T6 · Elongation at break: typical, in 4DAluminum 7075-T6 · Young's modulus (stiffness): typical
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TIMETAL 6-4 PropertiesTIMETarchived copyTitanium · Yield strength: typical, plate (>0.187 in), annealed, 0.2% offsetTitanium · Ultimate tensile strength: typical, plate, annealedTitanium · Elongation at break: typical, in 2 in., plate annealedTitanium · Density: nominalTitanium · Poisson's ratio: mean of TIMET measurementsTitanium · Melting point: melting rangeTitanium · Max service temperature: upper recommended use temperature
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TIMETAL 6-4 Data SheetTIMETarchived copyTitanium · Young's modulus (stiffness): typical range, 20 °CTitanium · Thermal conductivity: typical, 20 °C, mill annealedTitanium · Thermal expansion: typical, mean 0-100 °CTitanium · Specific heat: typical, 20 °C
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Alloy 7075 Sheet, Coil & Plate Technical DataKaiser Aluminumarchived copyAluminum 7075-T6 · Density: nominalAluminum 7075-T6 · Thermal conductivity: typical, 20 °C, T651Aluminum 7075-T6 · Thermal expansion: typical, mean 20-100 °CAluminum 7075-T6 · Specific heat: typical, at 100 °CAluminum 7075-T6 · Melting point: melting range
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MIL-HDBK-5J, Metallic Materials and Elements for Aerospace Vehicle Structures (2003)U.S. Department of DefenseAluminum 7075-T6 · 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 7075-T6 stronger than Titanium?
Titanium is stronger: its yield strength is 885 MPa against 503 MPa for Aluminum 7075-T6 (1.76x).
Which is lighter, Aluminum 7075-T6 or Titanium?
Aluminum 7075-T6 is lighter: 2,800 kg/m³ against 4,430 kg/m³ for Titanium.
Which is stiffer, Aluminum 7075-T6 or Titanium?
Titanium is stiffer: Young's modulus 115 GPa against 71 GPa for Aluminum 7075-T6, so the same part in Titanium deflects less under the same load.
Which is lighter for the same job, Aluminum 7075-T6 or Titanium?
For the same stiffness or strength: Aluminum 7075-T6 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 7075-T6
Titanium
Stiff rod or tie (tension)
2% heavier
lighter
Stiff beam (bending)
lighter
25% heavier
Stiff panel or plate
lighter
35% heavier
Strong rod or tie
11% heavier
lighter
Strong beam
lighter
9% heavier
Strong panel or plate
lighter
19% 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 7075-T6 or Titanium?
Titanium stretches further before it breaks: 16% elongation at break against 11% for Aluminum 7075-T6.
Thermal
Which conducts heat better, Aluminum 7075-T6 or Titanium?
Aluminum 7075-T6 conducts heat better: 130 W/m·K against 6.6 W/m·K for Titanium.
Which expands less with temperature?
Titanium expands less: 9 µm/m·K against 23.4 µm/m·K for Aluminum 7075-T6.