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AZ81A Magnesium vs. C70700 Copper-nickel

AZ81A magnesium belongs to the magnesium alloys classification, while C70700 copper-nickel belongs to the copper alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 C70700 copper-nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 55
73
Elastic (Young's, Tensile) Modulus, GPa 46
120
Elongation at Break, % 3.0 to 8.8
39
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 18
46
Shear Strength, MPa 91 to 130
220
Tensile Strength: Ultimate (UTS), MPa 160 to 240
320
Tensile Strength: Yield (Proof), MPa 84
110

Thermal Properties

Latent Heat of Fusion, J/g 350
220
Maximum Temperature: Mechanical, °C 130
220
Melting Completion (Liquidus), °C 600
1120
Melting Onset (Solidus), °C 500
1060
Specific Heat Capacity, J/kg-K 990
390
Thermal Conductivity, W/m-K 84
59
Thermal Expansion, µm/m-K 27
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
11
Electrical Conductivity: Equal Weight (Specific), % IACS 65
12

Otherwise Unclassified Properties

Base Metal Price, % relative 12
34
Density, g/cm3 1.7
8.9
Embodied Carbon, kg CO2/kg material 23
3.4
Embodied Energy, MJ/kg 160
52
Embodied Water, L/kg 990
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.0 to 17
100
Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 78
51
Stiffness to Weight: Axial, points 15
7.6
Stiffness to Weight: Bending, points 70
19
Strength to Weight: Axial, points 26 to 39
10
Strength to Weight: Bending, points 38 to 50
12
Thermal Diffusivity, mm2/s 50
17
Thermal Shock Resistance, points 9.1 to 14
12

Alloy Composition

Aluminum (Al), % 7.0 to 8.1
0
Copper (Cu), % 0 to 0.1
88.5 to 90.5
Iron (Fe), % 0
0 to 0.050
Magnesium (Mg), % 89.8 to 92.5
0
Manganese (Mn), % 0.13 to 0.35
0 to 0.5
Nickel (Ni), % 0 to 0.010
9.5 to 10.5
Silicon (Si), % 0 to 0.3
0
Zinc (Zn), % 0.4 to 1.0
0
Residuals, % 0 to 0.3
0 to 0.5