Aluminum 7075-T6 vs. Aluminum A380

Compare Aluminum 7075-T6 vs. Aluminum A380 strength, stiffness, weight and thermal properties.

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Mechanical
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Yield strength	503MPasourcetypical, 0.2% offset, .500 in dia specimen	160MPasourcetypical, 25 °C
Ultimate tensile strength	572MPasourcetypical	320MPasourcetypical, 25 °C
Elongation at break	11%sourcetypical, in 4D	3.5%sourcetypical
Young's modulus (stiffness)	71GPasourcetypical	71GPasourcetypical, 25 °C
Density	2,800kg/m³sourcenominal	2,713kg/m³sourcetypical at 68 °F
Strength to weight	180kN·m/kg3.05x higher	59kN·m/kg
Stiffness to weight	25.4MN·m/kg	26.2MN·m/kg3% higher
Poisson's ratio	0.33sourcetypical (handbook physical constant)	not sourced
Shear modulus	26.7GPa	not sourced
Bulk modulus	69.6GPa	not sourced
Speed of sound	5,036m/s	5,116m/s
Thermal
Thermal conductivity	130W/m·Ksourcetypical, 20 °C, T651	96.2W/m·Ksourcetypical at 68 °F
Thermal expansion	23.4µm/m·Ksourcetypical, mean 20-100 °C	21.8µm/m·Ksourcetypical, 68-572 °F (20-300 °C)
100 mm part over a 50 °C swing	117µm growth	109µm growth7% less
Specific heat	960J/kg·Ksourcetypical, at 100 °C	963J/kg·Ksourcetypical at 68 °F
Heats up and cools (diffusivity)	48.4mm²/s31% faster	36.8mm²/s
Thermal shock resistance	26,370W/m	not sourced
Melting point	532–635°Csourcemelting range	not sourced
Values for	7075-T6/T651, Kaiser Aluminum rod & bar (mechanical) and sheet/coil/plate (physical) typical datasheets; 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 7075-T6 stronger than Aluminum A380?

Aluminum 7075-T6 is stronger: its yield strength is 503 MPa against 160 MPa for Aluminum A380 (3.14x).

Which is lighter, Aluminum 7075-T6 or Aluminum A380?

Aluminum A380 is lighter: 2,713 kg/m³ against 2,800 kg/m³ for Aluminum 7075-T6.

Which is stiffer, Aluminum 7075-T6 or Aluminum A380?

Aluminum 7075-T6 is stiffer: Young's modulus 71 GPa against 71 GPa for Aluminum A380, so the same part in Aluminum 7075-T6 deflects less under the same load.

Which is lighter for the same job, Aluminum 7075-T6 or Aluminum A380?

For the same stiffness or strength: Aluminum 7075-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), stiff panel or plate.

Part that must be	Aluminum 7075-T6	Aluminum A380
Stiff rod or tie (tension)	3% heavier	lighter
Stiff beam (bending)	3% heavier	lighter
Stiff panel or plate	3% heavier	lighter
Strong rod or tie	lighter	3.05x heavier
Strong beam	lighter	2.08x heavier
Strong panel or plate	lighter	1.72x 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 7075-T6 or Aluminum A380?

Aluminum 7075-T6 conducts heat better: 130 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 23.4 µm/m·K for Aluminum 7075-T6.

Among 72 materials

Stiffness against density

Strength against density