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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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
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TIMETAL 6-4 PropertiesTIMETarchived copyTitanium · Yield strength: typical, plate (>0.187 in), annealed, 0.2% offsetTitanium · Ultimate tensile strength: typical, plate, annealedTitanium · Elongation at break: typical, in 2 in., plate annealedTitanium · Density: nominalTitanium · Poisson's ratio: mean of TIMET measurementsTitanium · Melting point: melting rangeTitanium · Max service temperature: upper recommended use temperature
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TIMETAL 6-4 Data SheetTIMETarchived copyTitanium · Young's modulus (stiffness): typical range, 20 °CTitanium · Thermal conductivity: typical, 20 °C, mill annealedTitanium · Thermal expansion: typical, mean 0-100 °CTitanium · Specific heat: typical, 20 °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.
Questions
Mechanical
Is Nickel Inconel 718 stronger than Titanium?
Nickel Inconel 718 is stronger: its yield strength is 1,207 MPa against 885 MPa for Titanium (36%).
Which is lighter, Nickel Inconel 718 or Titanium?
Titanium is lighter: 4,430 kg/m³ against 8,221 kg/m³ for Nickel Inconel 718.
Which is stiffer, Nickel Inconel 718 or Titanium?
Nickel Inconel 718 is stiffer: Young's modulus 200 GPa against 115 GPa for Titanium, so the same part in Nickel Inconel 718 deflects less under the same load.
Which is lighter for the same job, Nickel Inconel 718 or Titanium?
For the same stiffness or strength: Titanium is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate.
Part that must be
Nickel Inconel 718
Titanium
Stiff rod or tie (tension)
6% heavier
lighter
Stiff beam (bending)
40% heavier
lighter
Stiff panel or plate
1.54x heavier
lighter
Strong rod or tie
36% heavier
lighter
Strong beam
1.51x heavier
lighter
Strong panel or plate
1.59x 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, Nickel Inconel 718 or Titanium?
Nickel Inconel 718 stretches further before it breaks: 20% elongation at break against 16% for Titanium.
Thermal
Which conducts heat better, Nickel Inconel 718 or Titanium?
Nickel Inconel 718 conducts heat better: 11.4 W/m·K against 6.6 W/m·K for Titanium.
Which expands less with temperature?
Titanium expands less: 9 µm/m·K against 13.2 µm/m·K for Nickel Inconel 718.