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AZ81A Magnesium vs. C81400 Copper

AZ81A magnesium belongs to the magnesium alloys classification, while C81400 copper belongs to the copper alloys. There are 28 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 AZ81A magnesium and the bottom bar is C81400 copper.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
120
Elongation at Break, % 3.0 to 8.8
11
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 18
41
Tensile Strength: Ultimate (UTS), MPa 160 to 240
370
Tensile Strength: Yield (Proof), MPa 84
250

Thermal Properties

Latent Heat of Fusion, J/g 350
210
Maximum Temperature: Mechanical, °C 130
200
Melting Completion (Liquidus), °C 600
1090
Melting Onset (Solidus), °C 500
1070
Specific Heat Capacity, J/kg-K 990
390
Thermal Conductivity, W/m-K 84
260
Thermal Expansion, µm/m-K 27
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
60
Electrical Conductivity: Equal Weight (Specific), % IACS 65
61

Otherwise Unclassified Properties

Base Metal Price, % relative 12
33
Density, g/cm3 1.7
8.9
Embodied Carbon, kg CO2/kg material 23
2.8
Embodied Energy, MJ/kg 160
45
Embodied Water, L/kg 990
310

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.0 to 17
36
Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 78
260
Stiffness to Weight: Axial, points 15
7.3
Stiffness to Weight: Bending, points 70
18
Strength to Weight: Axial, points 26 to 39
11
Strength to Weight: Bending, points 38 to 50
13
Thermal Diffusivity, mm2/s 50
75
Thermal Shock Resistance, points 9.1 to 14
13

Alloy Composition

Aluminum (Al), % 7.0 to 8.1
0
Beryllium (Be), % 0
0.020 to 0.1
Chromium (Cr), % 0
0.6 to 1.0
Copper (Cu), % 0 to 0.1
98.4 to 99.38
Magnesium (Mg), % 89.8 to 92.5
0
Manganese (Mn), % 0.13 to 0.35
0
Nickel (Ni), % 0 to 0.010
0
Silicon (Si), % 0 to 0.3
0
Zinc (Zn), % 0.4 to 1.0
0
Residuals, % 0 to 0.3
0 to 0.5