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AWS E3155 vs. AZ91D Magnesium

AWS E3155 belongs to the iron alloys classification, while AZ91D magnesium belongs to the magnesium alloys. There are 22 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 AWS E3155 and the bottom bar is AZ91D magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
46
Elongation at Break, % 23
2.3 to 4.5
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
18
Tensile Strength: Ultimate (UTS), MPa 770
160 to 220

Thermal Properties

Latent Heat of Fusion, J/g 310
350
Melting Completion (Liquidus), °C 1460
600
Melting Onset (Solidus), °C 1410
490
Specific Heat Capacity, J/kg-K 450
990
Thermal Conductivity, W/m-K 13
78
Thermal Expansion, µm/m-K 13
27

Otherwise Unclassified Properties

Base Metal Price, % relative 70
12
Density, g/cm3 8.4
1.7
Embodied Carbon, kg CO2/kg material 7.7
22
Embodied Energy, MJ/kg 110
160
Embodied Water, L/kg 300
990

Common Calculations

Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
69
Strength to Weight: Axial, points 26
26 to 34
Strength to Weight: Bending, points 22
38 to 46
Thermal Diffusivity, mm2/s 3.3
45
Thermal Shock Resistance, points 20
9.5 to 13

Alloy Composition

Aluminum (Al), % 0
8.3 to 9.7
Carbon (C), % 0 to 0.1
0
Chromium (Cr), % 20 to 22.5
0
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0 to 0.75
0 to 0.030
Iron (Fe), % 23.3 to 36.3
0 to 0.0050
Magnesium (Mg), % 0
88.7 to 91.2
Manganese (Mn), % 1.0 to 2.5
0.15 to 0.5
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
0 to 0.0020
Niobium (Nb), % 0.75 to 1.3
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.1
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 2.0 to 3.0
0
Zinc (Zn), % 0
0.35 to 1.0