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AWS E3155 vs. AZ91A Magnesium

AWS E3155 belongs to the iron alloys classification, while AZ91A magnesium belongs to the magnesium alloys. There are 22 material properties with values for both materials. Properties with values for just one material (12, 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 AZ91A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
46
Elongation at Break, % 23
5.0
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
18
Tensile Strength: Ultimate (UTS), MPa 770
240

Thermal Properties

Latent Heat of Fusion, J/g 310
360
Melting Completion (Liquidus), °C 1460
600
Melting Onset (Solidus), °C 1410
470
Specific Heat Capacity, J/kg-K 450
990
Thermal Conductivity, W/m-K 13
73
Thermal Expansion, µm/m-K 13
26

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
38
Strength to Weight: Bending, points 22
49
Thermal Diffusivity, mm2/s 3.3
42
Thermal Shock Resistance, points 20
14

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 0.1
Iron (Fe), % 23.3 to 36.3
0
Magnesium (Mg), % 0
88.2 to 91.2
Manganese (Mn), % 1.0 to 2.5
0.13 to 0.5
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
0 to 0.030
Niobium (Nb), % 0.75 to 1.3
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 2.0 to 3.0
0
Zinc (Zn), % 0
0.35 to 1.0