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EN-MC21120 Magnesium vs. AWS BNi-7

EN-MC21120 magnesium belongs to the magnesium alloys classification, while AWS BNi-7 belongs to the nickel alloys. There are 19 material properties with values for both materials. Properties with values for just one material (13, 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 EN-MC21120 magnesium and the bottom bar is AWS BNi-7.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
170
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 18
67
Tensile Strength: Ultimate (UTS), MPa 200 to 270
550

Thermal Properties

Latent Heat of Fusion, J/g 350
280
Melting Completion (Liquidus), °C 600
890
Melting Onset (Solidus), °C 490
890
Specific Heat Capacity, J/kg-K 990
490
Thermal Expansion, µm/m-K 26
11

Otherwise Unclassified Properties

Base Metal Price, % relative 12
55
Density, g/cm3 1.7
8.0
Embodied Carbon, kg CO2/kg material 22
8.8
Embodied Energy, MJ/kg 160
120
Embodied Water, L/kg 990
240

Common Calculations

Stiffness to Weight: Axial, points 15
12
Stiffness to Weight: Bending, points 69
23
Strength to Weight: Axial, points 31 to 43
19
Strength to Weight: Bending, points 43 to 53
19
Thermal Shock Resistance, points 11 to 16
21

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
0 to 0.050
Boron (B), % 0
0 to 0.010
Carbon (C), % 0
0 to 0.060
Chromium (Cr), % 0
13 to 15
Cobalt (Co), % 0
0 to 0.1
Copper (Cu), % 0 to 0.030
0
Iron (Fe), % 0 to 0.0050
0 to 0.2
Magnesium (Mg), % 88.6 to 91.3
0
Manganese (Mn), % 0.1 to 0.5
0 to 0.040
Nickel (Ni), % 0 to 0.0020
73.3 to 77.3
Phosphorus (P), % 0
9.7 to 10.5
Selenium (Se), % 0
0 to 0.0050
Silicon (Si), % 0 to 0.2
0 to 0.1
Sulfur (S), % 0
0 to 0.020
Titanium (Ti), % 0
0 to 0.050
Zinc (Zn), % 0.35 to 1.0
0
Zirconium (Zr), % 0
0 to 0.050
Residuals, % 0 to 0.010
0 to 0.5