Aluminum 1100-O vs. Aluminum 7075-T6

Compare Aluminum 1100-O vs. Aluminum 7075-T6 strength, stiffness, weight and thermal properties.

Change either side

Mechanical
Try it on a partA sample part to run stress or thermal on, free in your browser	Open in LessCAD	Open in LessCAD
Yield strength	35MPasourcetypical, O, 0.0625 in specimen	503MPasourcetypical, 0.2% offset, .500 in dia specimen
Ultimate tensile strength	90MPasourcetypical, O	572MPasourcetypical
Elongation at break	35%sourcetypical, O, in 4D	11%sourcetypical, in 4D
Young's modulus (stiffness)	69GPasourcetypical	71GPasourcetypical
Density	2,710kg/m³sourcenominal, 20 °C	2,800kg/m³sourcenominal
Strength to weight	12.9kN·m/kg	180kN·m/kg13.9x higher
Stiffness to weight	25.5MN·m/kg	25.4MN·m/kg
Poisson's ratio	not sourced	0.33sourcetypical (handbook physical constant)
Shear modulus	not sourced	26.7GPa
Bulk modulus	not sourced	69.6GPa
Speed of sound	5,046m/s	5,036m/s
Thermal
Thermal conductivity	222W/m·Ksourcetypical, O, 20 °C	130W/m·Ksourcetypical, 20 °C, T651
Thermal expansion	23.6µm/m·Ksourcetypical, mean 20-100 °C	23.4µm/m·Ksourcetypical, mean 20-100 °C
100 mm part over a 50 °C swing	118µm growth	117µm growth
Specific heat	901J/kg·Ksourcebase material: commercially pure aluminium EN AW-1050A (Hydro), 20 °C	960J/kg·Ksourcetypical, at 100 °C
Heats up and cools (diffusivity)	90.9mm²/s1.88x faster	48.4mm²/s
Thermal shock resistance	not sourced	26,370W/m
Melting point	640–655°Csourcemelting range	532–635°Csourcemelting range
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).	7075-T6/T651, Kaiser Aluminum rod & bar (mechanical) and sheet/coil/plate (physical) typical datasheets; Poisson from MIL-HDBK-5J

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 Aluminum 7075-T6?

Aluminum 7075-T6 is stronger: its yield strength is 503 MPa against 35 MPa for Aluminum 1100-O (14.4x).

Which is lighter, Aluminum 1100-O or Aluminum 7075-T6?

Aluminum 1100-O is lighter: 2,710 kg/m³ against 2,800 kg/m³ for Aluminum 7075-T6.

Which is stiffer, Aluminum 1100-O or Aluminum 7075-T6?

Aluminum 7075-T6 is stiffer: Young's modulus 71 GPa against 69 GPa for Aluminum 1100-O, so the same part in Aluminum 7075-T6 deflects less under the same load.

Which is lighter for the same job, Aluminum 1100-O or Aluminum 7075-T6?

For the same stiffness or strength: Aluminum 1100-O is lighter for a stiff beam (bending), stiff panel or plate; Aluminum 7075-T6 is lighter for a strong rod or tie, strong beam, strong panel or plate.

Part that must be	Aluminum 1100-O	Aluminum 7075-T6
Stiff rod or tie (tension)	about equal	about equal
Stiff beam (bending)	lighter	2% heavier
Stiff panel or plate	lighter	2% heavier
Strong rod or tie	13.9x heavier	lighter
Strong beam	5.72x heavier	lighter
Strong panel or plate	3.67x 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 Aluminum 7075-T6?

Aluminum 1100-O conducts heat better: 222 W/m·K against 130 W/m·K for Aluminum 7075-T6.

Which expands less with temperature?

Aluminum 7075-T6 expands less: 23.4 µm/m·K against 23.6 µm/m·K for Aluminum 1100-O.

Among 72 materials

Stiffness against density

Strength against density