Thermal conductivity against densityHigher and further left: spreads more heat for its weightThermal expansion against thermal conductivityLower and further right: warps less when heated
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Sources5 documents: Kaiser Aluminum, Daiki Aluminium Industry, S.S. Aluminum, U.S. Department of Defense
Aluminum 7050-T7451
7050-T7451 plate, Kaiser Aluminum sheet, coil & plate typical datasheet (longitudinal); Poisson from MIL-HDBK-5J
Aluminum ADC12
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.
NA Alloys Product DataDaiki Aluminium IndustryAluminum ADC12 · Yield strength: one test result, 0.2% proof stress, as cast, ASTM tensile bar (Daiki)Aluminum ADC12 · Ultimate tensile strength: one test result, as cast, ASTM tensile bar (Daiki)Aluminum ADC12 · Elongation at break: one test result, as cast, ASTM tensile bar (Daiki)
3
Die-Casting Alloys (ダイカスト用合金)S.S. AluminumAluminum ADC12 · Young's modulus (stiffness): standard value (S.S.Aluminum)
4
DIK365 Product DataDaiki Aluminium IndustryAluminum ADC12 · Density: measured (Daiki)Aluminum ADC12 · Thermal conductivity: measured on specimens cut from a 50 x 100 x 5 mm flat die casting (Daiki)Aluminum ADC12 · Thermal expansion: measured, temperature range not stated (Daiki)Aluminum ADC12 · Specific heat: measured (Daiki)Aluminum ADC12 · Melting point: solidus-liquidus (Daiki)
5
MIL-HDBK-5J, Metallic Materials and Elements for Aerospace Vehicle Structures (2003)U.S. Department of DefenseAluminum 7050-T7451 · Poisson's ratio: typical (handbook physical constant)
Each number points to the document that states it, with the exact basis. Values without a number are computed from the sourced ones. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Questions
Mechanical
Is Aluminum 7050-T7451 stronger than Aluminum ADC12?
Aluminum 7050-T7451 is stronger: its yield strength is 469 MPa against 149 MPa for Aluminum ADC12 (3.15x).
Which is lighter, Aluminum 7050-T7451 or Aluminum ADC12?
Aluminum ADC12 is lighter: 2,680 kg/m³ against 2,830 kg/m³ for Aluminum 7050-T7451.
Which is stiffer, Aluminum 7050-T7451 or Aluminum ADC12?
Aluminum ADC12 is stiffer: Young's modulus 79.8 GPa against 70.3 GPa for Aluminum 7050-T7451, so the same part in Aluminum ADC12 deflects less under the same load.
Which is lighter for the same job, Aluminum 7050-T7451 or Aluminum ADC12?
For the same stiffness or strength: Aluminum 7050-T7451 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 7050-T7451
Aluminum ADC12
Stiff rod or tie (tension)
20% heavier
lighter
Stiff beam (bending)
13% heavier
lighter
Stiff panel or plate
10% heavier
lighter
Strong rod or tie
lighter
2.98x heavier
Strong beam
lighter
2.03x heavier
Strong panel or plate
lighter
1.68x 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 is more ductile, Aluminum 7050-T7451 or Aluminum ADC12?
Aluminum 7050-T7451 stretches further before it breaks: 11% elongation at break against 2.3% for Aluminum ADC12.
Thermal
Which conducts heat better, Aluminum 7050-T7451 or Aluminum ADC12?
Aluminum 7050-T7451 conducts heat better: 157 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 23.5 µm/m·K for Aluminum 7050-T7451.