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AZ91A Magnesium vs. C90800 Bronze

AZ91A magnesium belongs to the magnesium alloys classification, while C90800 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 AZ91A magnesium and the bottom bar is C90800 bronze.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
90
Elastic (Young's, Tensile) Modulus, GPa 46
110
Elongation at Break, % 5.0
13
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 18
40
Tensile Strength: Ultimate (UTS), MPa 240
330
Tensile Strength: Yield (Proof), MPa 160
170

Thermal Properties

Latent Heat of Fusion, J/g 360
190
Maximum Temperature: Mechanical, °C 130
170
Melting Completion (Liquidus), °C 600
990
Melting Onset (Solidus), °C 470
870
Specific Heat Capacity, J/kg-K 990
370
Thermal Conductivity, W/m-K 73
68
Thermal Expansion, µm/m-K 26
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
11
Electrical Conductivity: Equal Weight (Specific), % IACS 52
11

Otherwise Unclassified Properties

Base Metal Price, % relative 12
36
Density, g/cm3 1.7
8.7
Embodied Carbon, kg CO2/kg material 22
3.8
Embodied Energy, MJ/kg 160
62
Embodied Water, L/kg 990
410

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
35
Resilience: Unit (Modulus of Resilience), kJ/m3 280
140
Stiffness to Weight: Axial, points 15
6.9
Stiffness to Weight: Bending, points 69
18
Strength to Weight: Axial, points 38
11
Strength to Weight: Bending, points 49
12
Thermal Diffusivity, mm2/s 42
21
Thermal Shock Resistance, points 14
12

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0 to 0.0050
Antimony (Sb), % 0
0 to 0.2
Copper (Cu), % 0 to 0.1
85.3 to 89
Iron (Fe), % 0
0 to 0.15
Lead (Pb), % 0
0 to 0.25
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0
Nickel (Ni), % 0 to 0.030
0 to 0.5
Phosphorus (P), % 0
0 to 0.3
Silicon (Si), % 0 to 0.5
0 to 0.0050
Sulfur (S), % 0
0 to 0.050
Tin (Sn), % 0
11 to 13
Zinc (Zn), % 0.35 to 1.0
0 to 0.25