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EQ21A Magnesium vs. Automotive Grey Cast Iron

EQ21A 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 (7, 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 EQ21A magnesium and the bottom bar is automotive grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 80
160 to 280
Elastic (Young's, Tensile) Modulus, GPa 44
180
Elongation at Break, % 2.4
9.6 to 14
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
69 to 70
Tensile Strength: Ultimate (UTS), MPa 250
140 to 290
Tensile Strength: Yield (Proof), MPa 190
94 to 200

Thermal Properties

Latent Heat of Fusion, J/g 340
260 to 280
Melting Completion (Liquidus), °C 640
1380 to 1390
Melting Onset (Solidus), °C 560
1340 to 1350
Specific Heat Capacity, J/kg-K 980
490
Thermal Conductivity, W/m-K 110
41 to 43
Thermal Expansion, µm/m-K 27
12 to 14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 25
7.4 to 7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 120
8.8 to 9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 80
1.9 to 3.0
Density, g/cm3 1.9
7.5 to 7.6
Embodied Carbon, kg CO2/kg material 27
1.5 to 1.7
Embodied Energy, MJ/kg 210
21 to 24

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.6
18 to 25
Resilience: Unit (Modulus of Resilience), kJ/m3 410
25 to 110
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 63
25
Strength to Weight: Axial, points 37
5.2 to 11
Strength to Weight: Bending, points 47
8.0 to 13
Thermal Diffusivity, mm2/s 62
11 to 12
Thermal Shock Resistance, points 15
4.2 to 8.6