Aluminum 1100-O vs. Titanium Ti-6Al-4V

Compare Aluminum 1100-O vs. Titanium Ti-6Al-4V strength, stiffness, weight and thermal properties.

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Mechanical
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Yield strength	35MPasourcetypical, O, 0.0625 in specimen	885MPasourcetypical, plate (>0.187 in), annealed, 0.2% offset
Ultimate tensile strength	90MPasourcetypical, O	940MPasourcetypical, plate, annealed
Elongation at break	35%sourcetypical, O, in 4D	16%sourcetypical, in 2 in., plate annealed
Young's modulus (stiffness)	69GPasourcetypical	107–122GPasourcetypical range, 20 °C
Density	2,710kg/m³sourcenominal, 20 °C	4,430kg/m³sourcenominal
Strength to weight	12.9kN·m/kg	200kN·m/kg15.5x higher
Stiffness to weight	25.5MN·m/kg	25.8MN·m/kg2% higher
Poisson's ratio	not sourced	0.342sourcemean of TIMET measurements
Shear modulus	not sourced	42.7GPa
Bulk modulus	not sourced	121GPa
Speed of sound	5,046m/s	5,084m/s
Thermal
Thermal conductivity	222W/m·Ksourcetypical, O, 20 °C	6.6W/m·Ksourcetypical, 20 °C, mill annealed
Thermal expansion	23.6µm/m·Ksourcetypical, mean 20-100 °C	9µm/m·Ksourcetypical, mean 0-100 °C
100 mm part over a 50 °C swing	118µm growth	45µm growth2.62x less
Specific heat	901J/kg·Ksourcebase material: commercially pure aluminium EN AW-1050A (Hydro), 20 °C	580J/kg·Ksourcetypical, 20 °C
Heats up and cools (diffusivity)	90.9mm²/s35.4x faster	2.57mm²/s
Thermal shock resistance	not sourced	3,730W/m
Melting point	640–655°Csourcemelting range	1,630–1,650°Csourcemelting range
Max service temperature	not sourced	400°Csourceupper recommended use temperature
Values for	1100-O (annealed) commercially pure aluminium, Kaiser Aluminum Tube & Pipe Alloy 1100 Technical Data (Rev. 05/06), typical properties; specific heat from Hydro EN AW-1050A (99.5% Al) extruded-products datasheet (10/2018).	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 1100-O stronger than Titanium Ti-6Al-4V?

Titanium Ti-6Al-4V is stronger: its yield strength is 885 MPa against 35 MPa for Aluminum 1100-O (25.3x).

Which is lighter, Aluminum 1100-O or Titanium Ti-6Al-4V?

Aluminum 1100-O is lighter: 2,710 kg/m³ against 4,430 kg/m³ for Titanium Ti-6Al-4V.

Which is stiffer, Aluminum 1100-O or Titanium Ti-6Al-4V?

Titanium Ti-6Al-4V is stiffer: Young's modulus 115 GPa against 69 GPa for Aluminum 1100-O, so the same part in Titanium Ti-6Al-4V deflects less under the same load.

Which is lighter for the same job, Aluminum 1100-O or Titanium Ti-6Al-4V?

For the same stiffness or strength: Aluminum 1100-O is lighter for a stiff beam (bending), stiff panel or plate; Titanium Ti-6Al-4V is lighter for a stiff rod or tie (tension), strong rod or tie, strong beam, strong panel or plate.

Part that must be	Aluminum 1100-O	Titanium Ti-6Al-4V
Stiff rod or tie (tension)	2% heavier	lighter
Stiff beam (bending)	lighter	27% heavier
Stiff panel or plate	lighter	38% heavier
Strong rod or tie	15.5x heavier	lighter
Strong beam	5.27x heavier	lighter
Strong panel or plate	3.08x heavier	lighter

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 1100-O or Titanium Ti-6Al-4V?

Aluminum 1100-O conducts heat better: 222 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 23.6 µm/m·K for Aluminum 1100-O.

Among 72 materials

Stiffness against density

Strength against density