Aluminum 7075-T6 vs. Titanium Ti-6Al-4V

Compare Aluminum 7075-T6 vs. Titanium Ti-6Al-4V strength, stiffness, weight and thermal properties.

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Mechanical
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Yield strength	503MPasourcetypical, 0.2% offset, .500 in dia specimen	885MPasourcetypical, plate (>0.187 in), annealed, 0.2% offset
Ultimate tensile strength	572MPasourcetypical	940MPasourcetypical, plate, annealed
Elongation at break	11%sourcetypical, in 4D	16%sourcetypical, in 2 in., plate annealed
Young's modulus (stiffness)	71GPasourcetypical	107–122GPasourcetypical range, 20 °C
Density	2,800kg/m³sourcenominal1.58x lighter	4,430kg/m³sourcenominal
Strength to weight	180kN·m/kg	200kN·m/kg11% higher
Stiffness to weight	25.4MN·m/kg	25.8MN·m/kg2% higher
Poisson's ratio	0.33sourcetypical (handbook physical constant)	0.342sourcemean of TIMET measurements
Shear modulus	26.7GPa	42.7GPa1.6x stiffer in shear
Bulk modulus	69.6GPa	121GPa
Speed of sound	5,036m/s	5,084m/s
Thermal
Thermal conductivity	130W/m·Ksourcetypical, 20 °C, T651	6.6W/m·Ksourcetypical, 20 °C, mill annealed
Thermal expansion	23.4µm/m·Ksourcetypical, mean 20-100 °C	9µm/m·Ksourcetypical, mean 0-100 °C
100 mm part over a 50 °C swing	117µm growth	45µm growth2.6x less
Specific heat	960J/kg·Ksourcetypical, at 100 °C	580J/kg·Ksourcetypical, 20 °C
Heats up and cools (diffusivity)	48.4mm²/s18.8x faster	2.57mm²/s
Thermal shock resistance	26,370W/m7.07x more resistant	3,730W/m
Melting point	532–635°Csourcemelting range	1,630–1,650°Csourcemelting range
Max service temperature	not sourced	400°Csourceupper recommended use temperature
Values for	7075-T6/T651, Kaiser Aluminum rod & bar (mechanical) and sheet/coil/plate (physical) typical datasheets; 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 7075-T6 stronger than Titanium Ti-6Al-4V?

Titanium Ti-6Al-4V 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 Ti-6Al-4V?

Aluminum 7075-T6 is lighter: 2,800 kg/m³ against 4,430 kg/m³ for Titanium Ti-6Al-4V.

Which is stiffer, Aluminum 7075-T6 or Titanium Ti-6Al-4V?

Titanium Ti-6Al-4V is stiffer: Young's modulus 115 GPa against 71 GPa for Aluminum 7075-T6, so the same part in Titanium Ti-6Al-4V deflects less under the same load.

Which is lighter for the same job, Aluminum 7075-T6 or Titanium Ti-6Al-4V?

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 Ti-6Al-4V is lighter for a stiff rod or tie (tension), strong rod or tie.

Part that must be	Aluminum 7075-T6	Titanium Ti-6Al-4V
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 conducts heat better, Aluminum 7075-T6 or Titanium Ti-6Al-4V?

Aluminum 7075-T6 conducts heat better: 130 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 23.4 µm/m·K for Aluminum 7075-T6.

Among 59 materials

Stiffness against density

Strength against density