Materials / Compare

Magnesium AZ31B-H24 vs. Magnesium AZ91D

Compare Magnesium AZ31B-H24 vs. Magnesium AZ91D strength, stiffness, weight and thermal properties.

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Magnesium AZ31B-H24Wrought
Magnesium AZ91DCast
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Mechanical
Yield strength220MPasourcetypical, H24, 0.5-6 mm, 0.2 % proof stress150MPasourcetypical, 0.2% tensile yield, ambient temperature
Ultimate tensile strength290MPasourcetypical, H24, 0.5-6 mm230MPasourcetypical, ambient temperature
Elongation at break13%sourcetypical, H24, 0.5-6 mm, gauge 5.65√A3%sourcetypical, ambient temperature
Young's modulus (stiffness)44.8GPasourcetypical (handbook physical constant)45GPasourcetypical
Density1,769kg/m³sourcenominal1,810kg/m³sourcetypical
Strength to weight124kN·m/kg1.5x higher82.9kN·m/kg
Stiffness to weight25.3MN·m/kg2% higher24.9MN·m/kg
Poisson's ratio0.35sourcetypical (handbook physical constant)0.35sourcebase material: AZ91C casting (MIL-HDBK-5J handbook physical constant)
Shear modulus16.6GPa16.7GPa
Bulk modulus49.8GPa50GPa
Speed of sound5,032m/s4,986m/s
Thermal
Thermal conductivity76.9W/m·Ksourcetypical (temper/temperature not stated)72W/m·Ksourcetypical
Thermal expansion26.8µm/m·Ksourcetypical (temperature range not stated)25µm/m·Ksourcetypical, temperature range not stated
100 mm part over a 50 °C swing134µm growth125µm growth7% less
Specific heat1,040J/kg·Ksourcetypical1,050J/kg·Ksourcetypical
Heats up and cools (diffusivity)41.8mm²/s10% faster37.9mm²/s
Thermal shock resistance9,159W/m47% more resistant6,240W/m
Melting pointnot sourced470–595°Csourcemelting range
Max service temperature149°Csourcestated application limitnot sourced
Values forAZ31B-H24 sheet 0.016-0.062 in., MIL-HDBK-5J Table 4.2.1.0(b) (AMS 4377); strengths are S-basis MINIMUMSELEKTRON AZ91D magnesium die-casting alloy, as cast; Magnesium Elektron datasheet 475 (7/01), typical properties; Poisson from MIL-HDBK-5J for AZ91C castings.

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 Magnesium AZ91D?

Magnesium AZ31B-H24 is stronger: its yield strength is 220 MPa against 150 MPa for Magnesium AZ91D (47%).

Which is lighter, Magnesium AZ31B-H24 or Magnesium AZ91D?

Magnesium AZ31B-H24 is lighter: 1,769 kg/m³ against 1,810 kg/m³ for Magnesium AZ91D.

Which is stiffer, Magnesium AZ31B-H24 or Magnesium AZ91D?

Magnesium AZ91D is stiffer: Young's modulus 45 GPa against 44.8 GPa for Magnesium AZ31B-H24, so the same part in Magnesium AZ91D deflects less under the same load.

Which is lighter for the same job, Magnesium AZ31B-H24 or Magnesium AZ91D?

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 rod or tie, strong beam, strong panel or plate.

Part that must beMagnesium AZ31B-H24Magnesium AZ91D
Stiff rod or tie (tension)lighter2% heavier
Stiff beam (bending)lighter2% heavier
Stiff panel or platelighter2% heavier
Strong rod or tielighter1.5x heavier
Strong beamlighter32% heavier
Strong panel or platelighter24% 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 Magnesium AZ91D?

Magnesium AZ31B-H24 conducts heat better: 76.9 W/m·K against 72 W/m·K for Magnesium AZ91D.

Which expands less with temperature?

Magnesium AZ91D expands less: 25 µm/m·K against 26.8 µm/m·K for Magnesium AZ31B-H24.

Among 72 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 C260Nickel Inconel 718Zinc 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 SteelPCB Laminate FR-4SiliconCeramic Alumina 96%Ceramic Aluminum NitrideAluminum A380Aluminum 6063-T6Aluminum 1100-OAluminum ADC12Solder SAC305Plastic PBT GF30Plastic PPS GF40Plastic LCP GF30Magnesium AZ31B-H24Magnesium AZ91D
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 C260Nickel Inconel 718Zinc 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 SteelBrickPCB Laminate FR-4SiliconCeramic Alumina 96%Aluminum A380Aluminum 6063-T6Aluminum 1100-OAluminum ADC12Solder SAC305Plastic PBT GF30Plastic PPS GF40Plastic LCP GF30Magnesium AZ31B-H24Magnesium AZ91D
Strength against density

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