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AZ91D Magnesium vs. Automotive Grey Cast Iron

AZ91D magnesium belongs to the magnesium alloys classification, while automotive grey cast iron belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (6, 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 AZ91D magnesium and the bottom bar is automotive grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 60 to 80
160 to 280
Elastic (Young's, Tensile) Modulus, GPa 46
180
Elongation at Break, % 2.3 to 4.5
9.6 to 14
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
69 to 70
Tensile Strength: Ultimate (UTS), MPa 160 to 220
140 to 290
Tensile Strength: Yield (Proof), MPa 80 to 130
94 to 200

Thermal Properties

Latent Heat of Fusion, J/g 350
260 to 280
Melting Completion (Liquidus), °C 600
1380 to 1390
Melting Onset (Solidus), °C 490
1340 to 1350
Specific Heat Capacity, J/kg-K 990
490
Thermal Conductivity, W/m-K 78
41 to 43
Thermal Expansion, µm/m-K 27
12 to 14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
7.4 to 7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 58
8.8 to 9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 12
1.9 to 3.0
Density, g/cm3 1.7
7.5 to 7.6
Embodied Carbon, kg CO2/kg material 22
1.5 to 1.7
Embodied Energy, MJ/kg 160
21 to 24
Embodied Water, L/kg 990
44 to 51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.2 to 7.7
18 to 25
Resilience: Unit (Modulus of Resilience), kJ/m3 69 to 170
25 to 110
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 26 to 34
5.2 to 11
Strength to Weight: Bending, points 38 to 46
8.0 to 13
Thermal Diffusivity, mm2/s 45
11 to 12
Thermal Shock Resistance, points 9.5 to 13
4.2 to 8.6