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AWS E320 vs. AZ91B Magnesium

AWS E320 belongs to the iron alloys classification, while AZ91B magnesium belongs to the magnesium alloys. There are 20 material properties with values for both materials. Properties with values for just one material (14, 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 AWS E320 and the bottom bar is AZ91B magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
46
Elongation at Break, % 34
5.0
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
18
Tensile Strength: Ultimate (UTS), MPa 620
240

Thermal Properties

Latent Heat of Fusion, J/g 300
360
Melting Completion (Liquidus), °C 1410
600
Melting Onset (Solidus), °C 1360
470
Specific Heat Capacity, J/kg-K 460
990
Thermal Expansion, µm/m-K 14
26

Otherwise Unclassified Properties

Base Metal Price, % relative 38
12
Density, g/cm3 8.2
1.7
Embodied Carbon, kg CO2/kg material 6.5
22
Embodied Energy, MJ/kg 91
160
Embodied Water, L/kg 220
990

Common Calculations

Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
69
Strength to Weight: Axial, points 21
38
Strength to Weight: Bending, points 20
49
Thermal Shock Resistance, points 16
14

Alloy Composition

Aluminum (Al), % 0
8.3 to 9.7
Carbon (C), % 0 to 0.070
0
Chromium (Cr), % 19 to 21
0
Copper (Cu), % 3.0 to 4.0
0 to 0.35
Iron (Fe), % 31.8 to 43.5
0
Magnesium (Mg), % 0
87.9 to 91.2
Manganese (Mn), % 0.5 to 2.5
0.13 to 0.5
Molybdenum (Mo), % 2.0 to 3.0
0
Nickel (Ni), % 32 to 36
0 to 0.030
Niobium (Nb), % 0 to 1.0
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 0.6
0 to 0.5
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
0.35 to 1.0