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AZ91B Magnesium vs. C19700 Copper

AZ91B magnesium belongs to the magnesium alloys classification, while C19700 copper belongs to the copper alloys. There are 29 material properties with values for both materials. Properties with values for just one material (6, 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 C19700 copper.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
120
Elongation at Break, % 5.0
2.4 to 13
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 18
43
Shear Strength, MPa 140
240 to 300
Tensile Strength: Ultimate (UTS), MPa 240
400 to 530
Tensile Strength: Yield (Proof), MPa 160
330 to 520

Thermal Properties

Latent Heat of Fusion, J/g 360
210
Maximum Temperature: Mechanical, °C 130
200
Melting Completion (Liquidus), °C 600
1090
Melting Onset (Solidus), °C 470
1040
Specific Heat Capacity, J/kg-K 990
390
Thermal Conductivity, W/m-K 73
250
Thermal Expansion, µm/m-K 26
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
86 to 88
Electrical Conductivity: Equal Weight (Specific), % IACS 58
87 to 89

Otherwise Unclassified Properties

Base Metal Price, % relative 12
30
Density, g/cm3 1.7
8.9
Embodied Carbon, kg CO2/kg material 22
2.6
Embodied Energy, MJ/kg 160
41
Embodied Water, L/kg 990
310

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
12 to 49
Resilience: Unit (Modulus of Resilience), kJ/m3 280
460 to 1160
Stiffness to Weight: Axial, points 15
7.2
Stiffness to Weight: Bending, points 69
18
Strength to Weight: Axial, points 38
12 to 16
Strength to Weight: Bending, points 49
14 to 16
Thermal Diffusivity, mm2/s 42
73
Thermal Shock Resistance, points 14
14 to 19

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
0
Cobalt (Co), % 0
0 to 0.050
Copper (Cu), % 0 to 0.35
97.4 to 99.59
Iron (Fe), % 0
0.3 to 1.2
Lead (Pb), % 0
0 to 0.050
Magnesium (Mg), % 87.9 to 91.2
0.010 to 0.2
Manganese (Mn), % 0.13 to 0.5
0 to 0.050
Nickel (Ni), % 0 to 0.030
0 to 0.050
Phosphorus (P), % 0
0.1 to 0.4
Silicon (Si), % 0 to 0.5
0
Tin (Sn), % 0
0 to 0.2
Zinc (Zn), % 0.35 to 1.0
0 to 0.2
Residuals, % 0
0 to 0.2