Aluminum vs. Aluminum ADC12

Compare Aluminum vs. Aluminum ADC12 strength, stiffness, weight and thermal properties.

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Mechanical
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Yield strength	276MPasourcetypical, 0.2% offset, .500 in dia specimen	149MPasourceone test result, 0.2% proof stress, as cast, ASTM tensile bar (Daiki)
Ultimate tensile strength	310MPasourcetypical	345MPasourceone test result, as cast, ASTM tensile bar (Daiki)
Elongation at break	17%sourcetypical, in 4D, 0.500 in dia specimen	2.3%sourceone test result, as cast, ASTM tensile bar (Daiki)
Young's modulus (stiffness)	68.3GPasourcetypical	79.8GPasourcestandard value (S.S.Aluminum)
Density	2,700kg/m³sourcenominal	2,680kg/m³sourcemeasured (Daiki)
Strength to weight	102kN·m/kg1.84x higher	55.6kN·m/kg
Stiffness to weight	25.3MN·m/kg	29.8MN·m/kg18% higher
Poisson's ratio	0.33sourcetypical (handbook physical constant)	not sourced
Shear modulus	25.7GPa	not sourced
Bulk modulus	67GPa	not sourced
Speed of sound	5,030m/s	5,457m/s
Thermal
Thermal conductivity	167W/m·Ksourcetypical, 20 °C	125W/m·Ksourcemeasured on specimens cut from a 50 x 100 x 5 mm flat die casting (Daiki)
Thermal expansion	23.6µm/m·Ksourcetypical, mean 20-100 °C	21µm/m·Ksourcemeasured, temperature range not stated (Daiki)
100 mm part over a 50 °C swing	118µm growth	105µm growth12% less
Specific heat	896J/kg·Ksourcetypical, at 100 °C	911J/kg·Ksourcemeasured (Daiki)
Heats up and cools (diffusivity)	69mm²/s35% faster	51.2mm²/s
Thermal shock resistance	19,159W/m	not sourced
Melting point	582–652°Csourcesolidus-liquidus	515–582°Csourcesolidus-liquidus (Daiki)
Values for	6061-T6/T651, Kaiser Aluminum typical properties (sheet, coil & plate datasheet); 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 stronger than Aluminum ADC12?

Aluminum is stronger: its yield strength is 276 MPa against 149 MPa for Aluminum ADC12 (1.85x).

Which is lighter, Aluminum or Aluminum ADC12?

Aluminum ADC12 is lighter: 2,680 kg/m³ against 2,700 kg/m³ for Aluminum.

Which is stiffer, Aluminum or Aluminum ADC12?

Aluminum ADC12 is stiffer: Young's modulus 79.8 GPa against 68.3 GPa for Aluminum, so the same part in Aluminum ADC12 deflects less under the same load.

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

For the same stiffness or strength: Aluminum 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	Aluminum ADC12
Stiff rod or tie (tension)	18% heavier	lighter
Stiff beam (bending)	9% heavier	lighter
Stiff panel or plate	6% heavier	lighter
Strong rod or tie	lighter	1.84x heavier
Strong beam	lighter	50% heavier
Strong panel or plate	lighter	35% 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 or Aluminum ADC12?

Aluminum conducts heat better: 167 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 23.6 µm/m·K for Aluminum.

Among 72 materials

Stiffness against density

Strength against density