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AZ81A Magnesium vs. C72800 Copper-nickel

AZ81A magnesium belongs to the magnesium alloys classification, while C72800 copper-nickel belongs to the copper alloys. There are 29 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 AZ81A magnesium and the bottom bar is C72800 copper-nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
120
Elongation at Break, % 3.0 to 8.8
3.9 to 23
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 18
44
Shear Strength, MPa 91 to 130
330 to 740
Tensile Strength: Ultimate (UTS), MPa 160 to 240
520 to 1270
Tensile Strength: Yield (Proof), MPa 84
250 to 1210

Thermal Properties

Latent Heat of Fusion, J/g 350
210
Maximum Temperature: Mechanical, °C 130
200
Melting Completion (Liquidus), °C 600
1080
Melting Onset (Solidus), °C 500
920
Specific Heat Capacity, J/kg-K 990
380
Thermal Conductivity, W/m-K 84
55
Thermal Expansion, µm/m-K 27
17

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 12
38
Density, g/cm3 1.7
8.8
Embodied Carbon, kg CO2/kg material 23
4.4
Embodied Energy, MJ/kg 160
68
Embodied Water, L/kg 990
360

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.0 to 17
37 to 99
Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 78
260 to 5650
Stiffness to Weight: Axial, points 15
7.4
Stiffness to Weight: Bending, points 70
19
Strength to Weight: Axial, points 26 to 39
17 to 40
Strength to Weight: Bending, points 38 to 50
16 to 30
Thermal Diffusivity, mm2/s 50
17
Thermal Shock Resistance, points 9.1 to 14
19 to 45

Alloy Composition

Aluminum (Al), % 7.0 to 8.1
0 to 0.1
Antimony (Sb), % 0
0 to 0.020
Bismuth (Bi), % 0
0 to 0.0010
Boron (B), % 0
0 to 0.0010
Copper (Cu), % 0 to 0.1
78.3 to 82.8
Iron (Fe), % 0
0 to 0.5
Lead (Pb), % 0
0 to 0.0050
Magnesium (Mg), % 89.8 to 92.5
0.0050 to 0.15
Manganese (Mn), % 0.13 to 0.35
0.050 to 0.3
Nickel (Ni), % 0 to 0.010
9.5 to 10.5
Niobium (Nb), % 0
0.1 to 0.3
Phosphorus (P), % 0
0 to 0.0050
Silicon (Si), % 0 to 0.3
0 to 0.050
Sulfur (S), % 0
0 to 0.0025
Tin (Sn), % 0
7.5 to 8.5
Titanium (Ti), % 0
0 to 0.010
Zinc (Zn), % 0.4 to 1.0
0 to 1.0
Residuals, % 0 to 0.3
0 to 0.3