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AZ91B Magnesium vs. C64700 Bronze

AZ91B magnesium belongs to the magnesium alloys classification, while C64700 bronze belongs to the copper alloys. There are 29 material properties with values for both materials. Properties with values for just one material (4, 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 C64700 bronze.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
120
Elongation at Break, % 5.0
9.0
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 18
44
Shear Strength, MPa 140
390
Tensile Strength: Ultimate (UTS), MPa 240
660
Tensile Strength: Yield (Proof), MPa 160
560

Thermal Properties

Latent Heat of Fusion, J/g 360
220
Maximum Temperature: Mechanical, °C 130
200
Melting Completion (Liquidus), °C 600
1090
Melting Onset (Solidus), °C 470
1030
Specific Heat Capacity, J/kg-K 990
390
Thermal Conductivity, W/m-K 73
210
Thermal Expansion, µm/m-K 26
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
38
Electrical Conductivity: Equal Weight (Specific), % IACS 58
38

Otherwise Unclassified Properties

Base Metal Price, % relative 12
31
Density, g/cm3 1.7
8.9
Embodied Carbon, kg CO2/kg material 22
2.7
Embodied Energy, MJ/kg 160
43
Embodied Water, L/kg 990
310

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
57
Resilience: Unit (Modulus of Resilience), kJ/m3 280
1370
Stiffness to Weight: Axial, points 15
7.3
Stiffness to Weight: Bending, points 69
18
Strength to Weight: Axial, points 38
21
Strength to Weight: Bending, points 49
19
Thermal Diffusivity, mm2/s 42
59
Thermal Shock Resistance, points 14
24

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
0
Copper (Cu), % 0 to 0.35
95.8 to 98
Iron (Fe), % 0
0 to 0.1
Lead (Pb), % 0
0 to 0.1
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0
Nickel (Ni), % 0 to 0.030
1.6 to 2.2
Silicon (Si), % 0 to 0.5
0.4 to 0.8
Zinc (Zn), % 0.35 to 1.0
0 to 0.5
Residuals, % 0
0 to 0.5