Titanium vs. Titanium Ti-6Al-4V

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

Mechanical	Titanium	Titanium Ti-6Al-4V
Yield strength	885MPa1	885MPa1
Ultimate tensile strength	940MPa1	940MPa1
Elongation at break	16%1	16%1
Young's modulus (stiffness)	107–122GPa2	107–122GPa2
Density	4,430kg/m³1	4,430kg/m³1
Strength to weight	200kN·m/kg	200kN·m/kg
Stiffness to weight	25.8MN·m/kg	25.8MN·m/kg
Poisson's ratio	0.3421	0.3421
Shear modulus	42.7GPa	42.7GPa
Bulk modulus	121GPa	121GPa
Speed of sound	5,084m/s	5,084m/s

Stiffness against densityHigher and further left: stiffer for its weight

Strength against densityHigher and further left: stronger for its weight

Thermal	Titanium	Titanium Ti-6Al-4V
Thermal conductivity	6.6W/m·K2	6.6W/m·K2
Thermal expansion	9µm/m·K2	9µm/m·K2
100 mm part over a 50 °C swing	45µm growth	45µm growth
Specific heat	580J/kg·K2	580J/kg·K2
Heats up and cools (diffusivity)	2.57mm²/s	2.57mm²/s
Thermal shock resistance	3,730W/m	3,730W/m
Melting point	melting range1,630–1,650°C1	melting range1,630–1,650°C1
Max service temperature	400°C1	400°C1

Thermal conductivity against densityHigher and further left: spreads more heat for its weight

Thermal expansion against thermal conductivityLower and further right: warps less when heated

Try it on a partA bracket to run stress or thermal on, free in your browser	Open in LessCAD	Open in LessCAD

Sources2 documents: TIMET

Titanium: TIMETAL 6-4 (Ti-6Al-4V Grade 5) annealed plate typical (TIMET properties manual) + TIMET datasheet TMC-0150 physical properties
Titanium Ti-6Al-4V: TIMETAL 6-4 (Ti-6Al-4V Grade 5) annealed plate typical (TIMET properties manual) + TIMET datasheet TMC-0150 physical properties

1
TIMETAL 6-4 PropertiesTIMETarchived copyTitanium · Yield strength: typical, plate (>0.187 in), annealed, 0.2% offsetTitanium Ti-6Al-4V · Yield strength: typical, plate (>0.187 in), annealed, 0.2% offsetTitanium · Ultimate tensile strength: typical, plate, annealedTitanium Ti-6Al-4V · Ultimate tensile strength: typical, plate, annealedTitanium · Elongation at break: typical, in 2 in., plate annealedTitanium Ti-6Al-4V · Elongation at break: typical, in 2 in., plate annealedTitanium · Density: nominalTitanium Ti-6Al-4V · Density: nominalTitanium · Poisson's ratio: mean of TIMET measurementsTitanium Ti-6Al-4V · Poisson's ratio: mean of TIMET measurementsTitanium · Melting point: melting rangeTitanium Ti-6Al-4V · Melting point: melting rangeTitanium · Max service temperature: upper recommended use temperatureTitanium Ti-6Al-4V · Max service temperature: upper recommended use temperature
2
TIMETAL 6-4 Data SheetTIMETarchived copyTitanium · Young's modulus (stiffness): typical range, 20 °CTitanium Ti-6Al-4V · Young's modulus (stiffness): typical range, 20 °CTitanium · Thermal conductivity: typical, 20 °C, mill annealedTitanium Ti-6Al-4V · Thermal conductivity: typical, 20 °C, mill annealedTitanium · Thermal expansion: typical, mean 0-100 °CTitanium Ti-6Al-4V · Thermal expansion: typical, mean 0-100 °CTitanium · Specific heat: typical, 20 °CTitanium Ti-6Al-4V · Specific heat: typical, 20 °C

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

Titanium is stronger: its yield strength is 885 MPa against 885 MPa for Titanium Ti-6Al-4V (0%).

Which is lighter, Titanium or Titanium Ti-6Al-4V?

Titanium is lighter: 4,430 kg/m³ against 4,430 kg/m³ for Titanium Ti-6Al-4V.

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

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

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

For the same stiffness or strength they weigh about the same.

Part that must be	Titanium	Titanium Ti-6Al-4V
Stiff rod or tie (tension)	about equal	about equal
Stiff beam (bending)	about equal	about equal
Stiff panel or plate	about equal	about equal
Strong rod or tie	about equal	about equal
Strong beam	about equal	about equal
Strong panel or plate	about equal	about equal

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).

Thermal

Which conducts heat better, Titanium or Titanium Ti-6Al-4V?

Titanium conducts heat better: 6.6 W/m·K against 6.6 W/m·K for Titanium Ti-6Al-4V.

Which expands less with temperature?

Titanium expands less: 9 µm/m·K against 9 µm/m·K for Titanium Ti-6Al-4V.