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AS41A Magnesium vs. Automotive Malleable Cast Iron

AS41A magnesium belongs to the magnesium alloys classification, while automotive malleable 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 AS41A magnesium and the bottom bar is automotive malleable cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
180
Elongation at Break, % 11
1.0 to 10
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
70
Tensile Strength: Ultimate (UTS), MPa 230
350 to 720
Tensile Strength: Yield (Proof), MPa 140
220 to 590

Thermal Properties

Latent Heat of Fusion, J/g 370
260
Melting Completion (Liquidus), °C 620
1410
Melting Onset (Solidus), °C 570
1370
Specific Heat Capacity, J/kg-K 1000
480
Thermal Conductivity, W/m-K 68
41
Thermal Expansion, µm/m-K 26
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 17
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 92
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 12
1.9
Density, g/cm3 1.6
7.6
Embodied Carbon, kg CO2/kg material 23
1.5
Embodied Energy, MJ/kg 160
20
Embodied Water, L/kg 980
45

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 21
6.8 to 30
Resilience: Unit (Modulus of Resilience), kJ/m3 220
130 to 950
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 72
25
Strength to Weight: Axial, points 38
13 to 26
Strength to Weight: Bending, points 50
14 to 24
Thermal Diffusivity, mm2/s 41
11
Thermal Shock Resistance, points 14
9.9 to 21

Alloy Composition

Aluminum (Al), % 3.5 to 5.0
0
Carbon (C), % 0
2.2 to 2.9
Copper (Cu), % 0 to 0.060
0
Iron (Fe), % 0
93.6 to 96.7
Magnesium (Mg), % 92.8 to 95.8
0
Manganese (Mn), % 0.2 to 0.5
0.15 to 1.3
Nickel (Ni), % 0 to 0.030
0
Phosphorus (P), % 0
0.020 to 0.15
Silicon (Si), % 0.5 to 1.5
0.9 to 1.9
Sulfur (S), % 0
0.020 to 0.2
Zinc (Zn), % 0 to 0.12
0