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AS41B Magnesium vs. Automotive Grey Cast Iron

AS41B magnesium belongs to the magnesium alloys classification, while automotive grey cast iron belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, 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 AS41B magnesium and the bottom bar is automotive grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
180
Elongation at Break, % 6.0
9.6 to 14
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
69 to 70
Tensile Strength: Ultimate (UTS), MPa 210
140 to 290
Tensile Strength: Yield (Proof), MPa 140
94 to 200

Thermal Properties

Latent Heat of Fusion, J/g 370
260 to 280
Melting Completion (Liquidus), °C 620
1380 to 1390
Melting Onset (Solidus), °C 570
1340 to 1350
Specific Heat Capacity, J/kg-K 1000
490
Thermal Conductivity, W/m-K 68
41 to 43
Thermal Expansion, µm/m-K 26
12 to 14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 17
7.4 to 7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 92
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 23
1.5 to 1.7
Embodied Energy, MJ/kg 160
21 to 24
Embodied Water, L/kg 980
44 to 51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
18 to 25
Resilience: Unit (Modulus of Resilience), kJ/m3 220
25 to 110
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 72
25
Strength to Weight: Axial, points 35
5.2 to 11
Strength to Weight: Bending, points 47
8.0 to 13
Thermal Diffusivity, mm2/s 41
11 to 12
Thermal Shock Resistance, points 13
4.2 to 8.6