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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Sources2 documents: Kaiser Aluminum, Special Metals
Aluminum 3003-O
3003-O (annealed) aluminium-manganese alloy, the heat-exchanger tube and brazing alloy, Kaiser Aluminum Tube & Pipe Alloy 3003 Technical Data (Rev. 05/06), typical properties; specific heat from the NIST cryogenic 3003-F fit at 293 K.
Nickel Inconel 718
INCONEL alloy 718, standard grade, 1750 °F/1 hr anneal + 1325 °F/8 hr F.C. to 1150 °F aged; Special Metals bulletin SMC-045 typical values
1
Alloy 3003 Tube & Pipe Technical Data, Rev. 05/06Kaiser Aluminumarchived copyAluminum 3003-O · Yield strength: typical, O, 0.0625 in specimenAluminum 3003-O · Ultimate tensile strength: typical, OAluminum 3003-O · Elongation at break: typical, O, in 4DAluminum 3003-O · Young's modulus (stiffness): typicalAluminum 3003-O · Density: nominal, 20 °CAluminum 3003-O · Thermal conductivity: typical, O, 20 °CAluminum 3003-O · Thermal expansion: typical, mean 20-100 °CAluminum 3003-O · Melting point: melting range
2
INCONEL alloy 718 (SMC-045)Special Metalsarchived copyNickel Inconel 718 · Yield strength: typical, 1.0 in. hot-rolled bar, 0.2% offsetNickel Inconel 718 · Ultimate tensile strength: typical, 1.0 in. barNickel Inconel 718 · Elongation at break: typical, 1.0 in. barNickel Inconel 718 · Young's modulus (stiffness): typical, 21 °C, annealed + agedNickel Inconel 718 · Density: nominal, annealed and agedNickel Inconel 718 · Poisson's ratio: typical, 21 °C, annealed + agedNickel Inconel 718 · Thermal conductivity: typical, 21 °C, annealed + aged (calculated from resistivity per footnote a)Nickel Inconel 718 · Thermal expansion: typical, mean 21-93 °C, annealed + agedNickel Inconel 718 · Specific heat: typical, 21 °CNickel Inconel 718 · Melting point: melting rangeNickel Inconel 718 · Max service temperature: upper use temperature stated by producer
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 3003-O stronger than Nickel Inconel 718?
Nickel Inconel 718 is stronger: its yield strength is 1,207 MPa against 40 MPa for Aluminum 3003-O (30.2x).
Which is lighter, Aluminum 3003-O or Nickel Inconel 718?
Aluminum 3003-O is lighter: 2,730 kg/m³ against 8,221 kg/m³ for Nickel Inconel 718.
Which is stiffer, Aluminum 3003-O or Nickel Inconel 718?
Nickel Inconel 718 is stiffer: Young's modulus 200 GPa against 69 GPa for Aluminum 3003-O, so the same part in Nickel Inconel 718 deflects less under the same load.
Which is lighter for the same job, Aluminum 3003-O or Nickel Inconel 718?
For the same stiffness or strength: Aluminum 3003-O is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate; Nickel Inconel 718 is lighter for a strong rod or tie, strong beam, strong panel or plate.
Part that must be
Aluminum 3003-O
Nickel Inconel 718
Stiff rod or tie (tension)
lighter
4% heavier
Stiff beam (bending)
lighter
1.77x heavier
Stiff panel or plate
lighter
2.11x heavier
Strong rod or tie
10x heavier
lighter
Strong beam
3.22x heavier
lighter
Strong panel or plate
1.82x heavier
lighter
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 3003-O or Nickel Inconel 718?
Aluminum 3003-O stretches further before it breaks: 30% elongation at break against 20% for Nickel Inconel 718.
Thermal
Which conducts heat better, Aluminum 3003-O or Nickel Inconel 718?
Aluminum 3003-O conducts heat better: 193 W/m·K against 11.4 W/m·K for Nickel Inconel 718.
Which expands less with temperature?
Nickel Inconel 718 expands less: 13.2 µm/m·K against 23.2 µm/m·K for Aluminum 3003-O.