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).
6061-T6/T651, Kaiser Aluminum typical properties; 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 6061-T6?
Aluminum 6061-T6 is stronger: its yield strength is 276 MPa against 35 MPa for Aluminum 1100-O (7.89x).
Which is lighter, Aluminum 1100-O or Aluminum 6061-T6?
Aluminum 6061-T6 is lighter: 2,700 kg/m³ against 2,710 kg/m³ for Aluminum 1100-O.
Which is stiffer, Aluminum 1100-O or Aluminum 6061-T6?
Aluminum 1100-O is stiffer: Young's modulus 69 GPa against 68.3 GPa for Aluminum 6061-T6, so the same part in Aluminum 1100-O deflects less under the same load.
Which is lighter for the same job, Aluminum 1100-O or Aluminum 6061-T6?
For the same stiffness or strength: Aluminum 6061-T6 is lighter for a strong rod or tie, strong beam, strong panel or plate.
Part that must be
Aluminum 1100-O
Aluminum 6061-T6
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
7.91x heavier
lighter
Strong beam
3.98x heavier
lighter
Strong panel or plate
2.82x 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 6061-T6?
Aluminum 1100-O conducts heat better: 222 W/m·K against 167 W/m·K for Aluminum 6061-T6.
Which expands less with temperature?
Aluminum 1100-O expands less: 23.6 µm/m·K against 23.6 µm/m·K for Aluminum 6061-T6.