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AZ91A Magnesium vs. Grey Cast Iron

AZ91A 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 (2, 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 grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
160 to 300
Compressive (Crushing) Strength, MPa 160
570 to 1290
Elastic (Young's, Tensile) Modulus, GPa 46
180
Elongation at Break, % 5.0
9.6
Fatigue Strength, MPa 99
69 to 170
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
69
Shear Strength, MPa 140
180 to 610
Tensile Strength: Ultimate (UTS), MPa 240
160 to 450
Tensile Strength: Yield (Proof), MPa 160
98 to 290

Thermal Properties

Latent Heat of Fusion, J/g 360
280
Melting Completion (Liquidus), °C 600
1380
Melting Onset (Solidus), °C 470
1180
Specific Heat Capacity, J/kg-K 990
490
Thermal Conductivity, W/m-K 73
46
Thermal Expansion, µm/m-K 26
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 52
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 11
13 to 37
Resilience: Unit (Modulus of Resilience), kJ/m3 280
27 to 240
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
5.8 to 17
Strength to Weight: Bending, points 49
8.7 to 17
Thermal Diffusivity, mm2/s 42
13
Thermal Shock Resistance, points 14
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 0.1
0
Iron (Fe), % 0
92.1 to 93.9
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0.5 to 0.7
Nickel (Ni), % 0 to 0.030
0
Phosphorus (P), % 0
0 to 0.9
Silicon (Si), % 0 to 0.5
2.5 to 2.8
Sulfur (S), % 0
0 to 0.15
Zinc (Zn), % 0.35 to 1.0
0