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Nickel Inconel 718 vs. Magnesium AZ31B-H24

Compare Nickel Inconel 718 vs. Magnesium AZ31B-H24 strength, stiffness, weight and thermal properties.

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Nickel Inconel 718Wrought
Magnesium AZ31B-H24Wrought
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Mechanical
Yield strength1,207MPasourcetypical, 1.0 in. hot-rolled bar, 0.2% offset220MPasourcetypical, H24, 0.5-6 mm, 0.2 % proof stress
Ultimate tensile strength1,389MPasourcetypical, 1.0 in. bar290MPasourcetypical, H24, 0.5-6 mm
Elongation at break20%sourcetypical, 1.0 in. bar13%sourcetypical, H24, 0.5-6 mm, gauge 5.65√A
Young's modulus (stiffness)200GPasourcetypical, 21 °C, annealed + aged44.8GPasourcetypical (handbook physical constant)
Density8,221kg/m³sourcenominal, annealed and aged1,769kg/m³sourcenominal
Strength to weight147kN·m/kg18% higher124kN·m/kg
Stiffness to weight24.3MN·m/kg25.3MN·m/kg4% higher
Poisson's ratio0.294sourcetypical, 21 °C, annealed + aged0.35sourcetypical (handbook physical constant)
Shear modulus77.3GPa4.66x stiffer in shear16.6GPa
Bulk modulus162GPa49.8GPa
Speed of sound4,932m/s5,032m/s
Thermal
Thermal conductivity11.4W/m·Ksourcetypical, 21 °C, annealed + aged (calculated from resistivity per footnote a)76.9W/m·Ksourcetypical (temper/temperature not stated)
Thermal expansion13.2µm/m·Ksourcetypical, mean 21-93 °C, annealed + aged26.8µm/m·Ksourcetypical (temperature range not stated)
100 mm part over a 50 °C swing66µm growth2.03x less134µm growth
Specific heat435J/kg·Ksourcetypical, 21 °C1,040J/kg·Ksourcetypical
Heats up and cools (diffusivity)3.19mm²/s41.8mm²/s13.1x faster
Thermal shock resistance3,680W/m9,159W/m2.49x more resistant
Melting point1,260–1,336°Csourcemelting rangenot sourced
Max service temperature704°Csourceupper use temperature stated by producer149°Csourcestated application limit
Values forINCONEL 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 valuesAZ31B-H24 sheet 0.016-0.062 in., MIL-HDBK-5J Table 4.2.1.0(b) (AMS 4377); strengths are S-basis MINIMUMS

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 Nickel Inconel 718 stronger than Magnesium AZ31B-H24?

Nickel Inconel 718 is stronger: its yield strength is 1,207 MPa against 220 MPa for Magnesium AZ31B-H24 (5.49x).

Which is lighter, Nickel Inconel 718 or Magnesium AZ31B-H24?

Magnesium AZ31B-H24 is lighter: 1,769 kg/m³ against 8,221 kg/m³ for Nickel Inconel 718.

Which is stiffer, Nickel Inconel 718 or Magnesium AZ31B-H24?

Nickel Inconel 718 is stiffer: Young's modulus 200 GPa against 44.8 GPa for Magnesium AZ31B-H24, 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 Magnesium AZ31B-H24?

For the same stiffness or strength: Nickel Inconel 718 is lighter for a strong rod or tie; Magnesium AZ31B-H24 is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong beam, strong panel or plate.

Part that must beNickel Inconel 718Magnesium AZ31B-H24
Stiff rod or tie (tension)4% heavierlighter
Stiff beam (bending)2.2x heavierlighter
Stiff panel or plate2.82x heavierlighter
Strong rod or tielighter18% heavier
Strong beam49% heavierlighter
Strong panel or plate1.98x heavierlighter

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, Nickel Inconel 718 or Magnesium AZ31B-H24?

Magnesium AZ31B-H24 conducts heat better: 76.9 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 26.8 µm/m·K for Magnesium AZ31B-H24.

Among 59 materials

1k10k0.1110100Density (kg/m³)Young's modulus (GPa)Plastic PLAPlastic PETGPlastic ABSPlastic TPUPlastic NylonAluminumSteelIronTitaniumSteel AISI 1018Stainless 304Stainless 316Aluminum 6061-T6Aluminum 7075-T6Brass C360Copper C110GlassSteel AISI 1045Steel AISI 4340Steel A992Stainless 303Stainless 17-4PHAluminum 2024-T351Aluminum 5052-H32Aluminum 7050-T7451Titanium Ti-6Al-4VBrass C260Zinc Zamak 3Plastic ABS (bulk/injection)Plastic PolycarbonatePlastic POM/AcetalPlastic Nylon PA6Plastic Nylon PA66Plastic PEEKPlastic UHMWPEPlastic HDPEPlastic PolypropylenePlastic PMMAFDM ASAFDM PolycarbonateFDM PAHT-CFFDM HIPSSLA Resin Tough 2000SLS PA12 NylonDMLS AlSi10Mg AluminumDMLS Ti-6Al-4V ELI TitaniumDMLS 316L Stainless SteelDMLS 17-4PH Stainless SteelNickel Inconel 718Magnesium AZ31B-H24
Stiffness against density
1k10k101001kDensity (kg/m³)Yield strength (MPa)Plastic PLAPlastic PETGPlastic ABSPlastic TPUPlastic NylonRubberAluminumSteelIronTitaniumSteel AISI 1018Stainless 304Stainless 316Aluminum 6061-T6Aluminum 7075-T6Brass C360Copper C110GlassSteel AISI 1045Steel AISI 4340Steel A992Stainless 303Stainless 17-4PHAluminum 2024-T351Aluminum 5052-H32Aluminum 7050-T7451Titanium Ti-6Al-4VBrass C260Zinc Zamak 3Plastic ABS (bulk/injection)Plastic PolycarbonatePlastic POM/AcetalPlastic Nylon PA6Plastic Nylon PA66Plastic PEEKPlastic PTFEPlastic UHMWPEPlastic HDPEPlastic PolypropylenePlastic PMMAFDM ASAFDM PolycarbonateFDM PAHT-CFFDM HIPSSLA Resin Tough 2000SLA Resin Elastic 50ASLS PA12 NylonDMLS AlSi10Mg AluminumDMLS Ti-6Al-4V ELI TitaniumDMLS 316L Stainless SteelDMLS 17-4PH Stainless SteelBrickNickel Inconel 718Magnesium AZ31B-H24
Strength against density

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