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AZ91B Magnesium vs. SAE-AISI M1 Steel

AZ91B magnesium belongs to the magnesium alloys classification, while SAE-AISI M1 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 M1 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
77
Tensile Strength: Ultimate (UTS), MPa 240
730 to 2140

Thermal Properties

Latent Heat of Fusion, J/g 360
270
Melting Completion (Liquidus), °C 600
1560
Melting Onset (Solidus), °C 470
1510
Specific Heat Capacity, J/kg-K 990
450
Thermal Conductivity, W/m-K 73
29
Thermal Expansion, µm/m-K 26
12

Otherwise Unclassified Properties

Base Metal Price, % relative 12
18
Density, g/cm3 1.7
8.1
Embodied Carbon, kg CO2/kg material 22
7.0
Embodied Energy, MJ/kg 160
99
Embodied Water, L/kg 990
98

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 38
25 to 73
Strength to Weight: Bending, points 49
22 to 45
Thermal Diffusivity, mm2/s 42
8.0
Thermal Shock Resistance, points 14
23 to 66

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.78 to 0.88
Chromium (Cr), % 0
3.5 to 4.0
Copper (Cu), % 0 to 0.35
0 to 0.25
Iron (Fe), % 0
81 to 84.8
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0.15 to 0.4
Molybdenum (Mo), % 0
8.2 to 9.2
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 0.5
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
1.4 to 2.1
Vanadium (V), % 0
1.0 to 1.4
Zinc (Zn), % 0.35 to 1.0
0