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ISO-WD32250 Magnesium vs. Automotive Malleable Cast Iron

ISO-WD32250 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 ISO-WD32250 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, % 4.5 to 8.6
1.0 to 10
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
70
Tensile Strength: Ultimate (UTS), MPa 310 to 330
350 to 720
Tensile Strength: Yield (Proof), MPa 240 to 290
220 to 590

Thermal Properties

Latent Heat of Fusion, J/g 340
260
Melting Completion (Liquidus), °C 600
1410
Melting Onset (Solidus), °C 550
1370
Specific Heat Capacity, J/kg-K 980
480
Thermal Conductivity, W/m-K 130
41
Thermal Expansion, µm/m-K 26
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 25
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 130
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 13
1.9
Density, g/cm3 1.8
7.6
Embodied Carbon, kg CO2/kg material 24
1.5
Embodied Energy, MJ/kg 160
20
Embodied Water, L/kg 950
45

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 14 to 26
6.8 to 30
Resilience: Unit (Modulus of Resilience), kJ/m3 630 to 930
130 to 950
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 67
25
Strength to Weight: Axial, points 49 to 51
13 to 26
Strength to Weight: Bending, points 58 to 60
14 to 24
Thermal Diffusivity, mm2/s 72
11
Thermal Shock Resistance, points 19 to 20
9.9 to 21

Alloy Composition


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Carbon (C), % 0
2.2 to 2.9
Iron (Fe), % 0
93.6 to 96.7
Magnesium (Mg), % 94.9 to 97.1
0
Manganese (Mn), % 0
0.15 to 1.3
Phosphorus (P), % 0
0.020 to 0.15
Silicon (Si), % 0
0.9 to 1.9
Sulfur (S), % 0
0.020 to 0.2
Zinc (Zn), % 2.5 to 4.0
0
Zirconium (Zr), % 0.45 to 0.8
0
Residuals, % 0 to 0.3
0