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AZ91B Magnesium vs. C94400 Bronze

AZ91B magnesium belongs to the magnesium alloys classification, while C94400 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 C94400 bronze.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
55
Elastic (Young's, Tensile) Modulus, GPa 46
100
Elongation at Break, % 5.0
18
Poisson's Ratio 0.29
0.35
Shear Modulus, GPa 18
37
Tensile Strength: Ultimate (UTS), MPa 240
220
Tensile Strength: Yield (Proof), MPa 160
110

Thermal Properties

Latent Heat of Fusion, J/g 360
180
Maximum Temperature: Mechanical, °C 130
150
Melting Completion (Liquidus), °C 600
940
Melting Onset (Solidus), °C 470
790
Specific Heat Capacity, J/kg-K 990
350
Thermal Conductivity, W/m-K 73
52
Thermal Expansion, µm/m-K 26
19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
10
Electrical Conductivity: Equal Weight (Specific), % IACS 58
9.9

Otherwise Unclassified Properties

Base Metal Price, % relative 12
32
Density, g/cm3 1.7
9.1
Embodied Carbon, kg CO2/kg material 22
3.4
Embodied Energy, MJ/kg 160
54
Embodied Water, L/kg 990
390

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
33
Resilience: Unit (Modulus of Resilience), kJ/m3 280
60
Stiffness to Weight: Axial, points 15
6.1
Stiffness to Weight: Bending, points 69
17
Strength to Weight: Axial, points 38
6.8
Strength to Weight: Bending, points 49
9.0
Thermal Diffusivity, mm2/s 42
17
Thermal Shock Resistance, points 14
8.3

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0 to 0.0050
Antimony (Sb), % 0
0 to 0.8
Copper (Cu), % 0 to 0.35
76.1 to 84
Iron (Fe), % 0
0 to 0.15
Lead (Pb), % 0
9.0 to 12
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0
Nickel (Ni), % 0 to 0.030
0 to 1.0
Phosphorus (P), % 0
0 to 0.050
Silicon (Si), % 0 to 0.5
0 to 0.0050
Sulfur (S), % 0
0 to 0.080
Tin (Sn), % 0
7.0 to 9.0
Zinc (Zn), % 0.35 to 1.0
0 to 0.8