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AZ91D Magnesium vs. Grey Cast Iron

AZ91D magnesium belongs to the magnesium alloys classification, while grey cast iron belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (3, 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 grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 60 to 80
160 to 300
Compressive (Crushing) Strength, MPa 310 to 430
570 to 1290
Elastic (Young's, Tensile) Modulus, GPa 46
180
Elongation at Break, % 2.3 to 4.5
9.6
Fatigue Strength, MPa 74 to 85
69 to 170
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
69
Shear Strength, MPa 120 to 140
180 to 610
Tensile Strength: Ultimate (UTS), MPa 160 to 220
160 to 450
Tensile Strength: Yield (Proof), MPa 80 to 130
98 to 290

Thermal Properties

Latent Heat of Fusion, J/g 350
280
Melting Completion (Liquidus), °C 600
1380
Melting Onset (Solidus), °C 490
1180
Specific Heat Capacity, J/kg-K 990
490
Thermal Conductivity, W/m-K 78
46
Thermal Expansion, µm/m-K 27
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 58
8.9

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.2 to 7.7
13 to 37
Resilience: Unit (Modulus of Resilience), kJ/m3 69 to 170
27 to 240
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 26 to 34
5.8 to 17
Strength to Weight: Bending, points 38 to 46
8.7 to 17
Thermal Diffusivity, mm2/s 45
13
Thermal Shock Resistance, points 9.5 to 13
6.0 to 17

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
3.1 to 3.4
Copper (Cu), % 0 to 0.030
0
Iron (Fe), % 0 to 0.0050
92.1 to 93.9
Magnesium (Mg), % 88.7 to 91.2
0
Manganese (Mn), % 0.15 to 0.5
0.5 to 0.7
Nickel (Ni), % 0 to 0.0020
0
Phosphorus (P), % 0
0 to 0.9
Silicon (Si), % 0 to 0.1
2.5 to 2.8
Sulfur (S), % 0
0 to 0.15
Zinc (Zn), % 0.35 to 1.0
0