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Magnesium AZ31B-H24 vs. Nickel Inconel 718

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

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Magnesium AZ31B-H24Wrought
Nickel Inconel 718Wrought
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Mechanical
Yield strength220MPasourcetypical, H24, 0.5-6 mm, 0.2 % proof stress1,207MPasourcetypical, 1.0 in. hot-rolled bar, 0.2% offset
Ultimate tensile strength290MPasourcetypical, H24, 0.5-6 mm1,389MPasourcetypical, 1.0 in. bar
Elongation at break13%sourcetypical, H24, 0.5-6 mm, gauge 5.65√A20%sourcetypical, 1.0 in. bar
Young's modulus (stiffness)44.8GPasourcetypical (handbook physical constant)200GPasourcetypical, 21 °C, annealed + aged
Density1,769kg/m³sourcenominal8,221kg/m³sourcenominal, annealed and aged
Strength to weight124kN·m/kg147kN·m/kg18% higher
Stiffness to weight25.3MN·m/kg4% higher24.3MN·m/kg
Poisson's ratio0.35sourcetypical (handbook physical constant)0.294sourcetypical, 21 °C, annealed + aged
Shear modulus16.6GPa77.3GPa4.66x stiffer in shear
Bulk modulus49.8GPa162GPa
Speed of sound5,032m/s4,932m/s
Thermal
Thermal conductivity76.9W/m·Ksourcetypical (temper/temperature not stated)11.4W/m·Ksourcetypical, 21 °C, annealed + aged (calculated from resistivity per footnote a)
Thermal expansion26.8µm/m·Ksourcetypical (temperature range not stated)13.2µm/m·Ksourcetypical, mean 21-93 °C, annealed + aged
100 mm part over a 50 °C swing134µm growth66µm growth2.03x less
Specific heat1,040J/kg·Ksourcetypical435J/kg·Ksourcetypical, 21 °C
Heats up and cools (diffusivity)41.8mm²/s13.1x faster3.19mm²/s
Thermal shock resistance9,159W/m2.49x more resistant3,680W/m
Melting pointnot sourced1,260–1,336°Csourcemelting range
Max service temperature149°Csourcestated application limit704°Csourceupper use temperature stated by producer
Values forAZ31B-H24 sheet 0.016-0.062 in., MIL-HDBK-5J Table 4.2.1.0(b) (AMS 4377); strengths are S-basis MINIMUMSINCONEL 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

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 Magnesium AZ31B-H24 stronger than Nickel Inconel 718?

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

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

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

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

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, Magnesium AZ31B-H24 or Nickel Inconel 718?

For the same stiffness or strength: 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; Nickel Inconel 718 is lighter for a strong rod or tie.

Part that must beMagnesium AZ31B-H24Nickel Inconel 718
Stiff rod or tie (tension)lighter4% heavier
Stiff beam (bending)lighter2.2x heavier
Stiff panel or platelighter2.82x heavier
Strong rod or tie18% heavierlighter
Strong beamlighter49% heavier
Strong panel or platelighter1.98x 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 conducts heat better, Magnesium AZ31B-H24 or Nickel Inconel 718?

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 Steel 304Stainless Steel 316Aluminum 6061-T6Aluminum 7075-T6Brass C360Copper C110GlassSteel AISI 1045Steel AISI 4340Steel A992Stainless Steel 303Stainless Steel 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 SteelMagnesium AZ31B-H24Nickel Inconel 718
Stiffness against density
1k10k101001kDensity (kg/m³)Yield strength (MPa)Plastic PLAPlastic PETGPlastic ABSPlastic TPUPlastic NylonRubberAluminumSteelIronTitaniumSteel AISI 1018Stainless Steel 304Stainless Steel 316Aluminum 6061-T6Aluminum 7075-T6Brass C360Copper C110GlassSteel AISI 1045Steel AISI 4340Steel A992Stainless Steel 303Stainless Steel 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 SteelBrickMagnesium AZ31B-H24Nickel Inconel 718
Strength against density

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