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AZ81A Magnesium vs. C90300 Bronze

AZ81A magnesium belongs to the magnesium alloys classification, while C90300 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 AZ81A magnesium and the bottom bar is C90300 bronze.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
110
Elongation at Break, % 3.0 to 8.8
22
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 18
41
Tensile Strength: Ultimate (UTS), MPa 160 to 240
330
Tensile Strength: Yield (Proof), MPa 84
150

Thermal Properties

Latent Heat of Fusion, J/g 350
190
Maximum Temperature: Mechanical, °C 130
170
Melting Completion (Liquidus), °C 600
1000
Melting Onset (Solidus), °C 500
850
Specific Heat Capacity, J/kg-K 990
370
Thermal Conductivity, W/m-K 84
75
Thermal Expansion, µm/m-K 27
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
12
Electrical Conductivity: Equal Weight (Specific), % IACS 65
12

Otherwise Unclassified Properties

Base Metal Price, % relative 12
33
Density, g/cm3 1.7
8.7
Embodied Carbon, kg CO2/kg material 23
3.4
Embodied Energy, MJ/kg 160
56
Embodied Water, L/kg 990
370

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.0 to 17
59
Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 78
110
Stiffness to Weight: Axial, points 15
7.0
Stiffness to Weight: Bending, points 70
18
Strength to Weight: Axial, points 26 to 39
11
Strength to Weight: Bending, points 38 to 50
12
Thermal Diffusivity, mm2/s 50
23
Thermal Shock Resistance, points 9.1 to 14
12

Alloy Composition


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Aluminum (Al), % 7.0 to 8.1
0 to 0.0050
Antimony (Sb), % 0
0 to 0.2
Copper (Cu), % 0 to 0.1
86 to 89
Iron (Fe), % 0
0 to 0.2
Lead (Pb), % 0
0 to 0.3
Magnesium (Mg), % 89.8 to 92.5
0
Manganese (Mn), % 0.13 to 0.35
0
Nickel (Ni), % 0 to 0.010
0 to 1.0
Phosphorus (P), % 0
0 to 1.5
Silicon (Si), % 0 to 0.3
0 to 0.0050
Sulfur (S), % 0
0 to 0.050
Tin (Sn), % 0
7.5 to 9.0
Zinc (Zn), % 0.4 to 1.0
3.0 to 5.0
Residuals, % 0 to 0.3
0 to 0.6