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AZ91B Magnesium vs. AWS E385

AZ91B magnesium belongs to the magnesium alloys classification, while AWS E385 belongs to the iron alloys. There are 24 material properties with values for both materials. Properties with values for just one material (10, 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 E385.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
34
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
79
Tensile Strength: Ultimate (UTS), MPa 240
580

Thermal Properties

Latent Heat of Fusion, J/g 360
300
Melting Completion (Liquidus), °C 600
1440
Melting Onset (Solidus), °C 470
1390
Specific Heat Capacity, J/kg-K 990
460
Thermal Conductivity, W/m-K 73
14
Thermal Expansion, µm/m-K 26
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 58
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 12
31
Density, g/cm3 1.7
8.1
Embodied Carbon, kg CO2/kg material 22
5.8
Embodied Energy, MJ/kg 160
79
Embodied Water, L/kg 990
200

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 38
20
Strength to Weight: Bending, points 49
19
Thermal Diffusivity, mm2/s 42
3.6
Thermal Shock Resistance, points 14
15

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
19.5 to 21.5
Copper (Cu), % 0 to 0.35
1.2 to 2.0
Iron (Fe), % 0
41.8 to 50.1
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
1.0 to 2.5
Molybdenum (Mo), % 0
4.2 to 5.2
Nickel (Ni), % 0 to 0.030
24 to 26
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.5
0 to 0.9
Sulfur (S), % 0
0 to 0.020
Zinc (Zn), % 0.35 to 1.0
0