6061-T6/T651, Kaiser Aluminum typical properties; Poisson from MIL-HDBK-5J
A380 aluminium high-pressure die-casting alloy, typical properties; Rheocast Company (aluminium die caster, Germantown WI) A380 alloy data page.
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 6061-T6 stronger than Aluminum A380?
Aluminum 6061-T6 is stronger: its yield strength is 276 MPa against 160 MPa for Aluminum A380 (1.73x).
Which is lighter, Aluminum 6061-T6 or Aluminum A380?
Aluminum 6061-T6 is lighter: 2,700 kg/m³ against 2,713 kg/m³ for Aluminum A380.
Which is stiffer, Aluminum 6061-T6 or Aluminum A380?
Aluminum A380 is stiffer: Young's modulus 71 GPa against 68.3 GPa for Aluminum 6061-T6, so the same part in Aluminum A380 deflects less under the same load.
Which is lighter for the same job, Aluminum 6061-T6 or Aluminum A380?
For the same stiffness or strength: Aluminum 6061-T6 is lighter for a strong rod or tie, strong beam, strong panel or plate; Aluminum A380 is lighter for a stiff rod or tie (tension), stiff beam (bending).
Part that must be
Aluminum 6061-T6
Aluminum A380
Stiff rod or tie (tension)
3% heavier
lighter
Stiff beam (bending)
1% heavier
lighter
Stiff panel or plate
about equal
about equal
Strong rod or tie
lighter
1.73x heavier
Strong beam
lighter
45% heavier
Strong panel or plate
lighter
32% heavier
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 6061-T6 or Aluminum A380?
Aluminum 6061-T6 conducts heat better: 167 W/m·K against 96.2 W/m·K for Aluminum A380.
Which expands less with temperature?
Aluminum A380 expands less: 21.8 µm/m·K against 23.6 µm/m·K for Aluminum 6061-T6.