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AZ91A Magnesium vs. Automotive Malleable Cast Iron

AZ91A magnesium belongs to the magnesium alloys classification, while automotive malleable cast iron belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (5, 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 automotive malleable cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
130 to 290
Elastic (Young's, Tensile) Modulus, GPa 46
180
Elongation at Break, % 5.0
1.0 to 10
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
70
Tensile Strength: Ultimate (UTS), MPa 240
350 to 720
Tensile Strength: Yield (Proof), MPa 160
220 to 590

Thermal Properties

Latent Heat of Fusion, J/g 360
260
Melting Completion (Liquidus), °C 600
1410
Melting Onset (Solidus), °C 470
1370
Specific Heat Capacity, J/kg-K 990
480
Thermal Conductivity, W/m-K 73
41
Thermal Expansion, µm/m-K 26
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 52
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 12
1.9
Density, g/cm3 1.7
7.6
Embodied Carbon, kg CO2/kg material 22
1.5
Embodied Energy, MJ/kg 160
20
Embodied Water, L/kg 990
45

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
6.8 to 30
Resilience: Unit (Modulus of Resilience), kJ/m3 280
130 to 950
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
13 to 26
Strength to Weight: Bending, points 49
14 to 24
Thermal Diffusivity, mm2/s 42
11
Thermal Shock Resistance, points 14
9.9 to 21

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
2.2 to 2.9
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0
93.6 to 96.7
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 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 to 0.5
0.9 to 1.9
Sulfur (S), % 0
0.020 to 0.2
Zinc (Zn), % 0.35 to 1.0
0