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AZ91B Magnesium vs. SAE-AISI T5 Steel

AZ91B magnesium belongs to the magnesium alloys classification, while SAE-AISI T5 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 T5 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
210
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
80
Tensile Strength: Ultimate (UTS), MPa 240
860 to 2140

Thermal Properties

Latent Heat of Fusion, J/g 360
250
Melting Completion (Liquidus), °C 600
1810
Melting Onset (Solidus), °C 470
1750
Specific Heat Capacity, J/kg-K 990
410
Thermal Conductivity, W/m-K 73
21
Thermal Expansion, µm/m-K 26
11

Otherwise Unclassified Properties

Base Metal Price, % relative 12
60
Density, g/cm3 1.7
9.4
Embodied Carbon, kg CO2/kg material 22
11
Embodied Energy, MJ/kg 160
170
Embodied Water, L/kg 990
140

Common Calculations

Stiffness to Weight: Axial, points 15
12
Stiffness to Weight: Bending, points 69
21
Strength to Weight: Axial, points 38
25 to 63
Strength to Weight: Bending, points 49
21 to 39
Thermal Diffusivity, mm2/s 42
5.5
Thermal Shock Resistance, points 14
26 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 5.0
Cobalt (Co), % 0
7.0 to 9.5
Copper (Cu), % 0 to 0.35
0 to 0.25
Iron (Fe), % 0
60.6 to 68.3
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0.2 to 0.4
Molybdenum (Mo), % 0
0.5 to 1.3
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
17.5 to 19
Vanadium (V), % 0
1.8 to 2.4
Zinc (Zn), % 0.35 to 1.0
0