Materials / Compare

Brass C260 vs. Magnesium AZ91D

Compare Brass C260 vs. Magnesium AZ91D strength, stiffness, weight and thermal properties.

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Brass C260Wrought
Magnesium AZ91DCast
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Mechanical
Yield strength345MPasourcenominal, strip/flat, 0.5% extension (not 0.2% offset)150MPasourcetypical, 0.2% tensile yield, ambient temperature
Ultimate tensile strength427MPasourcenominal, strip/flat230MPasourcetypical, ambient temperature
Elongation at break23%sourcenominal, in 2.0 in., strip/flat3%sourcetypical, ambient temperature
Young's modulus (stiffness)110GPasourcetypical, temper-independent45GPasourcetypical
Density8,525kg/m³sourcenominal1,810kg/m³sourcetypical
Strength to weight40.5kN·m/kg82.9kN·m/kg2.05x higher
Stiffness to weight12.9MN·m/kg24.9MN·m/kg1.92x higher
Poisson's ratio0.34sourcereference value at room temperature (Wieland-M30 = CuZn30 = C26000, rolled products)0.35sourcebase material: AZ91C casting (MIL-HDBK-5J handbook physical constant)
Shear modulus41.2GPa2.47x stiffer in shear16.7GPa
Bulk modulus115GPa50GPa
Speed of sound3,597m/s4,986m/s
Thermal
Thermal conductivity121W/m·Ksourcetypical, 20 °C72W/m·Ksourcetypical
Thermal expansion20µm/m·Ksourcetypical, mean 20-300 °C25µm/m·Ksourcetypical, temperature range not stated
100 mm part over a 50 °C swing100µm growth25% less125µm growth
Specific heat377J/kg·Ksourcetypical, 20 °C1,050J/kg·Ksourcetypical
Heats up and cools (diffusivity)37.7mm²/s37.9mm²/s
Thermal shock resistance12,510W/m2x more resistant6,240W/m
Melting point916–954°Csourcesolidus-liquidus470–595°Csourcemelting range
Values forC26000 cartridge brass, H02 half hard flat/strip: CDA Electronic Connector Design Guide (mechanical) + CDA alloy page (physical)ELEKTRON 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 Brass C260 stronger than Magnesium AZ91D?

Brass C260 is stronger: its yield strength is 345 MPa against 150 MPa for Magnesium AZ91D (2.3x).

Which is lighter, Brass C260 or Magnesium AZ91D?

Magnesium AZ91D is lighter: 1,810 kg/m³ against 8,525 kg/m³ for Brass C260.

Which is stiffer, Brass C260 or Magnesium AZ91D?

Brass C260 is stiffer: Young's modulus 110 GPa against 45 GPa for Magnesium AZ91D, so the same part in Brass C260 deflects less under the same load.

Which is lighter for the same job, Brass C260 or Magnesium AZ91D?

For the same stiffness or strength: Magnesium AZ91D 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 beBrass C260Magnesium AZ91D
Stiff rod or tie (tension)1.92x heavierlighter
Stiff beam (bending)3.01x heavierlighter
Stiff panel or plate3.49x heavierlighter
Strong rod or tie2.05x heavierlighter
Strong beam2.7x heavierlighter
Strong panel or plate3.11x 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, Brass C260 or Magnesium AZ91D?

Brass C260 conducts heat better: 121 W/m·K against 72 W/m·K for Magnesium AZ91D.

Which expands less with temperature?

Brass C260 expands less: 20 µm/m·K against 25 µm/m·K for Magnesium AZ91D.

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-4VNickel Inconel 718Magnesium AZ31B-H24Zinc 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 GF30Brass C260Magnesium 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-4VNickel Inconel 718Magnesium AZ31B-H24Zinc 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 GF30Brass C260Magnesium AZ91D
Strength against density

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