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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Sources3 documents: Kaiser Aluminum, U.S. Department of Defense
Aluminum 3003-O
3003-O (annealed) aluminium-manganese alloy, the heat-exchanger tube and brazing alloy, Kaiser Aluminum Tube & Pipe Alloy 3003 Technical Data (Rev. 05/06), typical properties; specific heat from the NIST cryogenic 3003-F fit at 293 K.
Aluminum 7050-T7451
7050-T7451 plate, Kaiser Aluminum sheet, coil & plate typical datasheet (longitudinal); Poisson from MIL-HDBK-5J
1
Alloy 3003 Tube & Pipe Technical Data, Rev. 05/06Kaiser Aluminumarchived copyAluminum 3003-O · Yield strength: typical, O, 0.0625 in specimenAluminum 3003-O · Ultimate tensile strength: typical, OAluminum 3003-O · Elongation at break: typical, O, in 4DAluminum 3003-O · Young's modulus (stiffness): typicalAluminum 3003-O · Density: nominal, 20 °CAluminum 3003-O · Thermal conductivity: typical, O, 20 °CAluminum 3003-O · Thermal expansion: typical, mean 20-100 °CAluminum 3003-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)
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 3003-O stronger than Aluminum 7050-T7451?
Aluminum 7050-T7451 is stronger: its yield strength is 469 MPa against 40 MPa for Aluminum 3003-O (11.7x).
Which is lighter, Aluminum 3003-O or Aluminum 7050-T7451?
Aluminum 3003-O is lighter: 2,730 kg/m³ against 2,830 kg/m³ for Aluminum 7050-T7451.
Which is stiffer, Aluminum 3003-O or Aluminum 7050-T7451?
Aluminum 7050-T7451 is stiffer: Young's modulus 70.3 GPa against 69 GPa for Aluminum 3003-O, so the same part in Aluminum 7050-T7451 deflects less under the same load.
Which is lighter for the same job, Aluminum 3003-O or Aluminum 7050-T7451?
For the same stiffness or strength: Aluminum 3003-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 3003-O
Aluminum 7050-T7451
Stiff rod or tie (tension)
lighter
2% heavier
Stiff beam (bending)
lighter
3% heavier
Stiff panel or plate
lighter
3% heavier
Strong rod or tie
11.3x heavier
lighter
Strong beam
4.98x heavier
lighter
Strong panel or plate
3.3x 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 3003-O or Aluminum 7050-T7451?
Aluminum 3003-O stretches further before it breaks: 30% elongation at break against 11% for Aluminum 7050-T7451.
Thermal
Which conducts heat better, Aluminum 3003-O or Aluminum 7050-T7451?
Aluminum 3003-O conducts heat better: 193 W/m·K against 157 W/m·K for Aluminum 7050-T7451.
Which expands less with temperature?
Aluminum 3003-O expands less: 23.2 µm/m·K against 23.5 µm/m·K for Aluminum 7050-T7451.