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AZ81A Magnesium vs. C72900 Copper-nickel

AZ81A magnesium belongs to the magnesium alloys classification, while C72900 copper-nickel 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 AZ81A magnesium and the bottom bar is C72900 copper-nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
120
Elongation at Break, % 3.0 to 8.8
6.0 to 20
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 18
45
Shear Strength, MPa 91 to 130
540 to 630
Tensile Strength: Ultimate (UTS), MPa 160 to 240
870 to 1080
Tensile Strength: Yield (Proof), MPa 84
700 to 920

Thermal Properties

Latent Heat of Fusion, J/g 350
210
Maximum Temperature: Mechanical, °C 130
210
Melting Completion (Liquidus), °C 600
1120
Melting Onset (Solidus), °C 500
950
Specific Heat Capacity, J/kg-K 990
380
Thermal Conductivity, W/m-K 84
29
Thermal Expansion, µm/m-K 27
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 65
8.0

Otherwise Unclassified Properties

Base Metal Price, % relative 12
39
Density, g/cm3 1.7
8.8
Embodied Carbon, kg CO2/kg material 23
4.6
Embodied Energy, MJ/kg 160
72
Embodied Water, L/kg 990
360

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.0 to 17
49 to 210
Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 78
2030 to 3490
Stiffness to Weight: Axial, points 15
7.6
Stiffness to Weight: Bending, points 70
19
Strength to Weight: Axial, points 26 to 39
27 to 34
Strength to Weight: Bending, points 38 to 50
23 to 27
Thermal Diffusivity, mm2/s 50
8.6
Thermal Shock Resistance, points 9.1 to 14
31 to 38

Alloy Composition

Aluminum (Al), % 7.0 to 8.1
0
Copper (Cu), % 0 to 0.1
74.1 to 78
Iron (Fe), % 0
0 to 0.5
Lead (Pb), % 0
0 to 0.020
Magnesium (Mg), % 89.8 to 92.5
0 to 0.15
Manganese (Mn), % 0.13 to 0.35
0 to 0.3
Nickel (Ni), % 0 to 0.010
14.5 to 15.5
Niobium (Nb), % 0
0 to 0.1
Silicon (Si), % 0 to 0.3
0
Tin (Sn), % 0
7.5 to 8.5
Zinc (Zn), % 0.4 to 1.0
0 to 0.5
Residuals, % 0 to 0.3
0 to 0.3