Aluminum 7050-T7451 vs. Aluminum A380

Compare Aluminum 7050-T7451 vs. Aluminum A380 strength, stiffness, weight and thermal properties.

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Mechanical
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Yield strength	469MPasourcetypical, longitudinal, 0.2% offset	160MPasourcetypical, 25 °C
Ultimate tensile strength	524MPasourcetypical, longitudinal	320MPasourcetypical, 25 °C
Elongation at break	11%sourcetypical, longitudinal	3.5%sourcetypical
Young's modulus (stiffness)	70.3GPasourcetypical	71GPasourcetypical, 25 °C
Density	2,830kg/m³sourcenominal	2,713kg/m³sourcetypical at 68 °F
Strength to weight	166kN·m/kg2.81x higher	59kN·m/kg
Stiffness to weight	24.8MN·m/kg	26.2MN·m/kg5% higher
Poisson's ratio	0.33sourcetypical (handbook physical constant)	not sourced
Shear modulus	26.4GPa	not sourced
Bulk modulus	68.9GPa	not sourced
Speed of sound	4,984m/s	5,116m/s
Thermal
Thermal conductivity	157W/m·Ksourcetypical, 20 °C	96.2W/m·Ksourcetypical at 68 °F
Thermal expansion	23.5µm/m·Ksourcetypical, mean 20-100 °C	21.8µm/m·Ksourcetypical, 68-572 °F (20-300 °C)
100 mm part over a 50 °C swing	118µm growth	109µm growth8% less
Specific heat	860J/kg·Ksourcetypical, at 100 °C	963J/kg·Ksourcetypical at 68 °F
Heats up and cools (diffusivity)	64.5mm²/s1.75x faster	36.8mm²/s
Thermal shock resistance	29,862W/m	not sourced
Melting point	524–635°Csourcemelting range	not sourced
Values for	7050-T7451 plate, Kaiser Aluminum sheet, coil & plate typical datasheet (longitudinal); 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 7050-T7451 stronger than Aluminum A380?

Aluminum 7050-T7451 is stronger: its yield strength is 469 MPa against 160 MPa for Aluminum A380 (2.93x).

Which is lighter, Aluminum 7050-T7451 or Aluminum A380?

Aluminum A380 is lighter: 2,713 kg/m³ against 2,830 kg/m³ for Aluminum 7050-T7451.

Which is stiffer, Aluminum 7050-T7451 or Aluminum A380?

Aluminum A380 is stiffer: Young's modulus 71 GPa against 70.3 GPa for Aluminum 7050-T7451, so the same part in Aluminum A380 deflects less under the same load.

Which is lighter for the same job, Aluminum 7050-T7451 or Aluminum A380?

For the same stiffness or strength: Aluminum 7050-T7451 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), stiff panel or plate.

Part that must be	Aluminum 7050-T7451	Aluminum A380
Stiff rod or tie (tension)	5% heavier	lighter
Stiff beam (bending)	5% heavier	lighter
Stiff panel or plate	5% heavier	lighter
Strong rod or tie	lighter	2.81x heavier
Strong beam	lighter	1.96x heavier
Strong panel or plate	lighter	1.64x 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 7050-T7451 or Aluminum A380?

Aluminum 7050-T7451 conducts heat better: 157 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 23.5 µm/m·K for Aluminum 7050-T7451.

Among 72 materials

Stiffness against density

Strength against density