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AZ91B Magnesium vs. C87700 Bronze

AZ91B magnesium belongs to the magnesium alloys classification, while C87700 bronze belongs to the copper alloys. There are 28 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is AZ91B magnesium and the bottom bar is C87700 bronze.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
110
Elongation at Break, % 5.0
3.6
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
42
Tensile Strength: Ultimate (UTS), MPa 240
300
Tensile Strength: Yield (Proof), MPa 160
120

Thermal Properties

Latent Heat of Fusion, J/g 360
250
Maximum Temperature: Mechanical, °C 130
180
Melting Completion (Liquidus), °C 600
980
Melting Onset (Solidus), °C 470
900
Specific Heat Capacity, J/kg-K 990
400
Thermal Conductivity, W/m-K 73
120
Thermal Expansion, µm/m-K 26
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
45
Electrical Conductivity: Equal Weight (Specific), % IACS 58
48

Otherwise Unclassified Properties

Base Metal Price, % relative 12
29
Density, g/cm3 1.7
8.5
Embodied Carbon, kg CO2/kg material 22
2.7
Embodied Energy, MJ/kg 160
45
Embodied Water, L/kg 990
310

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
8.6
Resilience: Unit (Modulus of Resilience), kJ/m3 280
64
Stiffness to Weight: Axial, points 15
7.4
Stiffness to Weight: Bending, points 69
19
Strength to Weight: Axial, points 38
9.8
Strength to Weight: Bending, points 49
12
Thermal Diffusivity, mm2/s 42
34
Thermal Shock Resistance, points 14
11

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
0
Antimony (Sb), % 0
0 to 0.1
Copper (Cu), % 0 to 0.35
87.5 to 90.5
Iron (Fe), % 0
0 to 0.5
Lead (Pb), % 0
0 to 0.090
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 0.8
Nickel (Ni), % 0 to 0.030
0 to 0.25
Phosphorus (P), % 0
0 to 0.15
Silicon (Si), % 0 to 0.5
2.5 to 3.5
Tin (Sn), % 0
0 to 2.0
Zinc (Zn), % 0.35 to 1.0
7.0 to 9.0
Residuals, % 0
0 to 0.8