Aluminum 7075-T6 vs. Aluminum ADC12

Compare Aluminum 7075-T6 vs. Aluminum ADC12 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	149MPasourceone test result, 0.2% proof stress, as cast, ASTM tensile bar (Daiki)
Ultimate tensile strength	572MPasourcetypical	345MPasourceone test result, as cast, ASTM tensile bar (Daiki)
Elongation at break	11%sourcetypical, in 4D	2.3%sourceone test result, as cast, ASTM tensile bar (Daiki)
Young's modulus (stiffness)	71GPasourcetypical	79.8GPasourcestandard value (S.S.Aluminum)
Density	2,800kg/m³sourcenominal	2,680kg/m³sourcemeasured (Daiki)
Strength to weight	180kN·m/kg3.23x higher	55.6kN·m/kg
Stiffness to weight	25.4MN·m/kg	29.8MN·m/kg17% 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	5,457m/s
Thermal
Thermal conductivity	130W/m·Ksourcetypical, 20 °C, T651	125W/m·Ksourcemeasured on specimens cut from a 50 x 100 x 5 mm flat die casting (Daiki)
Thermal expansion	23.4µm/m·Ksourcetypical, mean 20-100 °C	21µm/m·Ksourcemeasured, temperature range not stated (Daiki)
100 mm part over a 50 °C swing	117µm growth	105µm growth11% less
Specific heat	960J/kg·Ksourcetypical, at 100 °C	911J/kg·Ksourcemeasured (Daiki)
Heats up and cools (diffusivity)	48.4mm²/s	51.2mm²/s6% faster
Thermal shock resistance	26,370W/m	not sourced
Melting point	532–635°Csourcemelting range	515–582°Csourcesolidus-liquidus (Daiki)
Values for	7075-T6/T651, Kaiser Aluminum rod & bar (mechanical) and sheet/coil/plate (physical) typical datasheets; Poisson from MIL-HDBK-5J	JIS ADC12 (Al-Si-Cu, about A383 / EN AC-46100) high-pressure die-casting alloy, as cast; physical properties from Daiki Aluminium Industry (ADC12 ingot producer) measured values; modulus from S.S.Aluminum (ADC12 ingot producer) standard values.

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 ADC12?

Aluminum 7075-T6 is stronger: its yield strength is 503 MPa against 149 MPa for Aluminum ADC12 (3.38x).

Which is lighter, Aluminum 7075-T6 or Aluminum ADC12?

Aluminum ADC12 is lighter: 2,680 kg/m³ against 2,800 kg/m³ for Aluminum 7075-T6.

Which is stiffer, Aluminum 7075-T6 or Aluminum ADC12?

Aluminum ADC12 is stiffer: Young's modulus 79.8 GPa against 71 GPa for Aluminum 7075-T6, so the same part in Aluminum ADC12 deflects less under the same load.

Which is lighter for the same job, Aluminum 7075-T6 or Aluminum ADC12?

For the same stiffness or strength: Aluminum 7075-T6 is lighter for a strong rod or tie, strong beam, strong panel or plate; Aluminum ADC12 is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate.

Part that must be	Aluminum 7075-T6	Aluminum ADC12
Stiff rod or tie (tension)	17% heavier	lighter
Stiff beam (bending)	11% heavier	lighter
Stiff panel or plate	9% heavier	lighter
Strong rod or tie	lighter	3.23x heavier
Strong beam	lighter	2.15x heavier
Strong panel or plate	lighter	1.76x 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 ADC12?

Aluminum 7075-T6 conducts heat better: 130 W/m·K against 125 W/m·K for Aluminum ADC12.

Which expands less with temperature?

Aluminum ADC12 expands less: 21 µm/m·K against 23.4 µm/m·K for Aluminum 7075-T6.

Among 72 materials

Stiffness against density

Strength against density