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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Sources6 documents: Kaiser Aluminum, EOS GmbH, Renishaw, U.S. Department of Defense
Aluminum 7075-T6
7075-T6/T651, Kaiser Aluminum rod & bar (mechanical) and sheet/coil/plate (physical) typical datasheets; Poisson from MIL-HDBK-5J
DMLS AlSi10Mg Aluminum
EOS Aluminium AlSi10Mg (powder 9011-0024), EOS M 290 | 30 µm process (AlSi10Mg_FlexM291 2.01), as manufactured, horizontal; machined (turned) specimens, ISO 6892-1 B10
1
Alloy 7075 Rod & Bar Technical DataKaiser Aluminumarchived copyAluminum 7075-T6 · Yield strength: typical, 0.2% offset, .500 in dia specimenAluminum 7075-T6 · Ultimate tensile strength: typicalAluminum 7075-T6 · Elongation at break: typical, in 4DAluminum 7075-T6 · Young's modulus (stiffness): typical
2
EOS Aluminium AlSi10Mg Material Data SheetEOS GmbHarchived copyDMLS AlSi10Mg Aluminum · Yield strength: typical, as manufactured, horizontalDMLS AlSi10Mg Aluminum · Ultimate tensile strength: typical, as manufactured, horizontalDMLS AlSi10Mg Aluminum · Elongation at break: typical at break, as manufactured, horizontalDMLS AlSi10Mg Aluminum · Thermal conductivity: typical, as manufactured, horizontal (ISO 22007-2)DMLS AlSi10Mg Aluminum · Thermal expansion: mean 25-100 °C, ASTM E228
3
RenAM 500 Series Aluminium AlSi10Mg Material Data SheetRenishawDMLS AlSi10Mg Aluminum · Young's modulus (stiffness): same material and process, different machine maker: Renishaw RenAM 500, 30 µm, as built, horizontal (XY)
4
Alloy 7075 Sheet, Coil & Plate Technical DataKaiser Aluminumarchived copyAluminum 7075-T6 · Density: nominalAluminum 7075-T6 · Thermal conductivity: typical, 20 °C, T651Aluminum 7075-T6 · Thermal expansion: typical, mean 20-100 °CAluminum 7075-T6 · Specific heat: typical, at 100 °CAluminum 7075-T6 · Melting point: melting range
5
EOS Aluminium AlSi10Mg Material Data Sheet, FlexLine, M 290 (2018)EOS GmbHarchived copyDMLS AlSi10Mg Aluminum · Density: typical part density (ISO 3369), EOS M 290, AlSi10Mg_030_FlexM291 (30 µm)
6
MIL-HDBK-5J, Metallic Materials and Elements for Aerospace Vehicle Structures (2003)U.S. Department of DefenseAluminum 7075-T6 · Poisson's ratio: typical (handbook physical constant)DMLS AlSi10Mg Aluminum · Poisson's ratio: base material: cast Al-Si-Mg alloy 359.0 (Al-9Si-0.6Mg, closest MIL-HDBK-5J alloy to AlSi10Mg / EN AC-43000)DMLS AlSi10Mg Aluminum · Specific heat: base material: cast Al-Si-Mg alloy 359.0 (MIL-HDBK-5J), at 100 °C
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.
DMLS AlSi10Mg Aluminum is 3D printed: its properties depend on build direction and print settings; these are typical values.
Questions
Mechanical
Is Aluminum 7075-T6 stronger than DMLS AlSi10Mg Aluminum?
Aluminum 7075-T6 is stronger: its yield strength is 503 MPa against 270 MPa for DMLS AlSi10Mg Aluminum (1.86x).
Which is lighter, Aluminum 7075-T6 or DMLS AlSi10Mg Aluminum?
DMLS AlSi10Mg Aluminum is lighter: 2,670 kg/m³ against 2,800 kg/m³ for Aluminum 7075-T6.
Which is stiffer, Aluminum 7075-T6 or DMLS AlSi10Mg Aluminum?
DMLS AlSi10Mg Aluminum is stiffer: Young's modulus 72 GPa against 71 GPa for Aluminum 7075-T6, so the same part in DMLS AlSi10Mg Aluminum deflects less under the same load.
Which is lighter for the same job, Aluminum 7075-T6 or DMLS AlSi10Mg Aluminum?
For the same stiffness or strength: Aluminum 7075-T6 is lighter for a strong rod or tie, strong beam, strong panel or plate; DMLS AlSi10Mg Aluminum is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate.
Part that must be
Aluminum 7075-T6
DMLS AlSi10Mg Aluminum
Stiff rod or tie (tension)
6% heavier
lighter
Stiff beam (bending)
6% heavier
lighter
Stiff panel or plate
5% heavier
lighter
Strong rod or tie
lighter
1.78x heavier
Strong beam
lighter
44% heavier
Strong panel or plate
lighter
30% 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).
Thermal
Which conducts heat better, Aluminum 7075-T6 or DMLS AlSi10Mg Aluminum?
Aluminum 7075-T6 conducts heat better: 130 W/m·K against 110 W/m·K for DMLS AlSi10Mg Aluminum.
Which expands less with temperature?
DMLS AlSi10Mg Aluminum expands less: 20 µm/m·K against 23.4 µm/m·K for Aluminum 7075-T6.