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AZ91A Magnesium vs. C86700 Bronze

AZ91A magnesium belongs to the magnesium alloys classification, while C86700 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 AZ91A magnesium and the bottom bar is C86700 bronze.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
110
Elongation at Break, % 5.0
17
Poisson's Ratio 0.29
0.31
Shear Modulus, GPa 18
41
Tensile Strength: Ultimate (UTS), MPa 240
630
Tensile Strength: Yield (Proof), MPa 160
250

Thermal Properties

Latent Heat of Fusion, J/g 360
180
Maximum Temperature: Mechanical, °C 130
130
Melting Completion (Liquidus), °C 600
880
Melting Onset (Solidus), °C 470
860
Specific Heat Capacity, J/kg-K 990
400
Thermal Conductivity, W/m-K 73
89
Thermal Expansion, µm/m-K 26
20

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
17
Electrical Conductivity: Equal Weight (Specific), % IACS 52
19

Otherwise Unclassified Properties

Base Metal Price, % relative 12
23
Density, g/cm3 1.7
7.9
Embodied Carbon, kg CO2/kg material 22
2.9
Embodied Energy, MJ/kg 160
49
Embodied Water, L/kg 990
340

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
86
Resilience: Unit (Modulus of Resilience), kJ/m3 280
290
Stiffness to Weight: Axial, points 15
7.5
Stiffness to Weight: Bending, points 69
20
Strength to Weight: Axial, points 38
22
Strength to Weight: Bending, points 49
21
Thermal Diffusivity, mm2/s 42
28
Thermal Shock Resistance, points 14
21

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
1.0 to 3.0
Copper (Cu), % 0 to 0.1
55 to 60
Iron (Fe), % 0
1.0 to 3.0
Lead (Pb), % 0
0.5 to 1.5
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
1.0 to 3.5
Nickel (Ni), % 0 to 0.030
0 to 1.0
Silicon (Si), % 0 to 0.5
0
Tin (Sn), % 0
0 to 1.5
Zinc (Zn), % 0.35 to 1.0
30 to 38
Residuals, % 0
0 to 1.0