Thermal conductivity against densityHigher and further left: spreads more heat for its weightThermal expansion against thermal conductivityLower and further right: warps less when heated
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Sources4 documents: Kaiser Aluminum, U.S. Department of Defense, Hydro
Aluminum 1100-O
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).
Aluminum 7050-T7451
7050-T7451 plate, Kaiser Aluminum sheet, coil & plate typical datasheet (longitudinal); Poisson from MIL-HDBK-5J
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Alloy 1100 Tube & Pipe Technical Data, Rev. 05/06Kaiser Aluminumarchived copyAluminum 1100-O · Yield strength: typical, O, 0.0625 in specimenAluminum 1100-O · Ultimate tensile strength: typical, OAluminum 1100-O · Elongation at break: typical, O, in 4DAluminum 1100-O · Young's modulus (stiffness): typicalAluminum 1100-O · Density: nominal, 20 °CAluminum 1100-O · Thermal conductivity: typical, O, 20 °CAluminum 1100-O · Thermal expansion: typical, mean 20-100 °CAluminum 1100-O · Melting point: melting range
MIL-HDBK-5J, Metallic Materials and Elements for Aerospace Vehicle Structures (2003)U.S. Department of DefenseAluminum 7050-T7451 · Poisson's ratio: typical (handbook physical constant)
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Technical Datasheet, Extruded Products: Alloy EN AW-1050AHydroAluminum 1100-O · Specific heat: base material: commercially pure aluminium EN AW-1050A (Hydro), 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 Aluminum 1100-O stronger than Aluminum 7050-T7451?
Aluminum 7050-T7451 is stronger: its yield strength is 469 MPa against 35 MPa for Aluminum 1100-O (13.4x).
Which is lighter, Aluminum 1100-O or Aluminum 7050-T7451?
Aluminum 1100-O is lighter: 2,710 kg/m³ against 2,830 kg/m³ for Aluminum 7050-T7451.
Which is stiffer, Aluminum 1100-O or Aluminum 7050-T7451?
Aluminum 7050-T7451 is stiffer: Young's modulus 70.3 GPa against 69 GPa for Aluminum 1100-O, so the same part in Aluminum 7050-T7451 deflects less under the same load.
Which is lighter for the same job, Aluminum 1100-O or Aluminum 7050-T7451?
For the same stiffness or strength: Aluminum 1100-O is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate; Aluminum 7050-T7451 is lighter for a strong rod or tie, strong beam, strong panel or plate.
Part that must be
Aluminum 1100-O
Aluminum 7050-T7451
Stiff rod or tie (tension)
lighter
2% heavier
Stiff beam (bending)
lighter
3% heavier
Stiff panel or plate
lighter
4% heavier
Strong rod or tie
12.8x heavier
lighter
Strong beam
5.4x heavier
lighter
Strong panel or plate
3.51x 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 is more ductile, Aluminum 1100-O or Aluminum 7050-T7451?
Aluminum 1100-O stretches further before it breaks: 35% elongation at break against 11% for Aluminum 7050-T7451.
Thermal
Which conducts heat better, Aluminum 1100-O or Aluminum 7050-T7451?
Aluminum 1100-O conducts heat better: 222 W/m·K against 157 W/m·K for Aluminum 7050-T7451.
Which expands less with temperature?
Aluminum 7050-T7451 expands less: 23.5 µm/m·K against 23.6 µm/m·K for Aluminum 1100-O.