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AZ91B Magnesium vs. AWS E33-31

AZ91B magnesium belongs to the magnesium alloys classification, while AWS E33-31 belongs to the iron 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 AZ91B magnesium and the bottom bar is AWS E33-31.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
210
Elongation at Break, % 5.0
29
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 18
81
Tensile Strength: Ultimate (UTS), MPa 240
810

Thermal Properties

Latent Heat of Fusion, J/g 360
320
Melting Completion (Liquidus), °C 600
1380
Melting Onset (Solidus), °C 470
1330
Specific Heat Capacity, J/kg-K 990
480
Thermal Expansion, µm/m-K 26
14

Otherwise Unclassified Properties

Base Metal Price, % relative 12
36
Density, g/cm3 1.7
7.9
Embodied Carbon, kg CO2/kg material 22
6.0
Embodied Energy, MJ/kg 160
86
Embodied Water, L/kg 990
260

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
28
Strength to Weight: Bending, points 49
24
Thermal Shock Resistance, points 14
19

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
31 to 35
Copper (Cu), % 0 to 0.35
0.4 to 0.8
Iron (Fe), % 0
24.7 to 34.8
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
2.5 to 4.0
Molybdenum (Mo), % 0
1.0 to 2.0
Nickel (Ni), % 0 to 0.030
30 to 32
Nitrogen (N), % 0
0.3 to 0.5
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 0.5
0 to 0.9
Sulfur (S), % 0
0 to 0.010
Zinc (Zn), % 0.35 to 1.0
0