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AZ91A Magnesium vs. SAE-AISI M62 Steel

AZ91A magnesium belongs to the magnesium alloys classification, while SAE-AISI M62 steel belongs to the iron alloys. There are 19 material properties with values for both materials. Properties with values for just one material (15, 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 AZ91A magnesium and the bottom bar is SAE-AISI M62 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
79
Tensile Strength: Ultimate (UTS), MPa 240
830 to 2440

Thermal Properties

Latent Heat of Fusion, J/g 360
260
Melting Completion (Liquidus), °C 600
1650
Melting Onset (Solidus), °C 470
1600
Specific Heat Capacity, J/kg-K 990
430
Thermal Expansion, µm/m-K 26
12

Otherwise Unclassified Properties

Base Metal Price, % relative 12
30
Density, g/cm3 1.7
8.5
Embodied Carbon, kg CO2/kg material 22
10
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 990
110

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
23
Strength to Weight: Axial, points 38
27 to 80
Strength to Weight: Bending, points 49
23 to 47
Thermal Shock Resistance, points 14
24 to 71

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
1.3 to 1.4
Chromium (Cr), % 0
3.5 to 4.0
Copper (Cu), % 0 to 0.1
0 to 0.25
Iron (Fe), % 0
73.6 to 77.4
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0.15 to 0.4
Molybdenum (Mo), % 0
10 to 11
Nickel (Ni), % 0 to 0.030
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.5
0.15 to 0.4
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
5.8 to 6.5
Vanadium (V), % 0
1.8 to 2.1
Zinc (Zn), % 0.35 to 1.0
0