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AZ91B Magnesium vs. AWS ENiCu-7

AZ91B magnesium belongs to the magnesium alloys classification, while AWS ENiCu-7 belongs to the nickel alloys. There are 24 material properties with values for both materials. Properties with values for just one material (9, 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 AWS ENiCu-7.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
160
Elongation at Break, % 5.0
34
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 18
62
Tensile Strength: Ultimate (UTS), MPa 240
550

Thermal Properties

Latent Heat of Fusion, J/g 360
280
Melting Completion (Liquidus), °C 600
1270
Melting Onset (Solidus), °C 470
1230
Specific Heat Capacity, J/kg-K 990
430
Thermal Conductivity, W/m-K 73
21
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
3.3
Electrical Conductivity: Equal Weight (Specific), % IACS 58
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 12
50
Density, g/cm3 1.7
8.7
Embodied Carbon, kg CO2/kg material 22
8.0
Embodied Energy, MJ/kg 160
110
Embodied Water, L/kg 990
250

Common Calculations

Stiffness to Weight: Axial, points 15
10
Stiffness to Weight: Bending, points 69
21
Strength to Weight: Axial, points 38
17
Strength to Weight: Bending, points 49
17
Thermal Diffusivity, mm2/s 42
5.5
Thermal Shock Resistance, points 14
18

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
0 to 0.75
Carbon (C), % 0
0 to 0.1
Copper (Cu), % 0 to 0.35
20.6 to 38
Iron (Fe), % 0
0 to 2.5
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 4.0
Nickel (Ni), % 0 to 0.030
62 to 69
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 0.5
0 to 1.5
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0
0 to 1.0
Zinc (Zn), % 0.35 to 1.0
0
Residuals, % 0
0 to 0.5