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AZ91B Magnesium vs. SAE-AISI T8 Steel

AZ91B magnesium belongs to the magnesium alloys classification, while SAE-AISI T8 steel belongs to the iron alloys. There are 21 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 AZ91B magnesium and the bottom bar is SAE-AISI T8 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
78
Tensile Strength: Ultimate (UTS), MPa 240
780 to 2140

Thermal Properties

Latent Heat of Fusion, J/g 360
250
Melting Completion (Liquidus), °C 600
1730
Melting Onset (Solidus), °C 470
1670
Specific Heat Capacity, J/kg-K 990
420
Thermal Conductivity, W/m-K 73
18
Thermal Expansion, µm/m-K 26
12

Otherwise Unclassified Properties

Base Metal Price, % relative 12
45
Density, g/cm3 1.7
9.0
Embodied Carbon, kg CO2/kg material 22
10
Embodied Energy, MJ/kg 160
160
Embodied Water, L/kg 990
120

Common Calculations

Stiffness to Weight: Axial, points 15
12
Stiffness to Weight: Bending, points 69
22
Strength to Weight: Axial, points 38
24 to 66
Strength to Weight: Bending, points 49
21 to 41
Thermal Diffusivity, mm2/s 42
4.8
Thermal Shock Resistance, points 14
24 to 66

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.75 to 0.85
Chromium (Cr), % 0
3.8 to 4.5
Cobalt (Co), % 0
4.3 to 5.8
Copper (Cu), % 0 to 0.35
0 to 0.25
Iron (Fe), % 0
69.3 to 75.4
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0.2 to 0.4
Molybdenum (Mo), % 0
0.4 to 1.0
Nickel (Ni), % 0 to 0.030
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.5
0.2 to 0.4
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
13.3 to 14.8
Vanadium (V), % 0
1.8 to 2.4
Zinc (Zn), % 0.35 to 1.0
0