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AZ81A Magnesium vs. Austenitic Grey Cast Iron

AZ81A magnesium belongs to the magnesium alloys classification, while austenitic grey cast iron belongs to the iron alloys. There are 20 material properties with values for both materials. Properties with values for just one material (14, 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 AZ81A magnesium and the bottom bar is austenitic grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 55
110 to 210
Elastic (Young's, Tensile) Modulus, GPa 46
180
Poisson's Ratio 0.29
0.29 to 0.3
Shear Modulus, GPa 18
69 to 72
Tensile Strength: Ultimate (UTS), MPa 160 to 240
150 to 230

Thermal Properties

Latent Heat of Fusion, J/g 350
280 to 350
Melting Completion (Liquidus), °C 600
1340 to 1400
Melting Onset (Solidus), °C 500
1290 to 1350
Specific Heat Capacity, J/kg-K 990
470 to 490
Thermal Expansion, µm/m-K 27
13 to 14

Otherwise Unclassified Properties

Base Metal Price, % relative 12
14 to 24
Density, g/cm3 1.7
7.7 to 8.1
Embodied Carbon, kg CO2/kg material 23
3.1 to 4.7
Embodied Energy, MJ/kg 160
43 to 65
Embodied Water, L/kg 990
93 to 120

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 70
23 to 25
Strength to Weight: Axial, points 26 to 39
5.3 to 8.2
Strength to Weight: Bending, points 38 to 50
7.9 to 11
Thermal Shock Resistance, points 9.1 to 14
4.5 to 6.5