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Austenitic Nodular Cast Iron vs. AZ91B Magnesium

Austenitic nodular cast iron belongs to the iron alloys classification, while AZ91B magnesium belongs to the magnesium alloys. There are 24 material properties with values for both materials. Properties with values for just one material (9, 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 austenitic nodular cast iron and the bottom bar is AZ91B magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140 to 240
63
Elastic (Young's, Tensile) Modulus, GPa 180 to 190
46
Elongation at Break, % 6.8 to 34
5.0
Poisson's Ratio 0.29 to 0.3
0.29
Shear Modulus, GPa 70 to 72
18
Tensile Strength: Ultimate (UTS), MPa 430 to 500
240
Tensile Strength: Yield (Proof), MPa 190 to 240
160

Thermal Properties

Latent Heat of Fusion, J/g 280 to 350
360
Melting Completion (Liquidus), °C 1340 to 1400
600
Melting Onset (Solidus), °C 1300 to 1360
470
Specific Heat Capacity, J/kg-K 470 to 490
990
Thermal Expansion, µm/m-K 13 to 14
26

Otherwise Unclassified Properties

Base Metal Price, % relative 16 to 25
12
Density, g/cm3 7.7 to 8.0
1.7
Embodied Carbon, kg CO2/kg material 3.5 to 4.9
22
Embodied Energy, MJ/kg 48 to 68
160
Embodied Water, L/kg 91 to 120
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 140
11
Resilience: Unit (Modulus of Resilience), kJ/m3 98 to 160
280
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24 to 25
69
Strength to Weight: Axial, points 15 to 18
38
Strength to Weight: Bending, points 16 to 18
49
Thermal Shock Resistance, points 12 to 15
14