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Austempered Cast Iron vs. AZ91A Magnesium

Austempered cast iron belongs to the iron alloys classification, while AZ91A magnesium belongs to the magnesium alloys. There are 26 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 austempered cast iron and the bottom bar is AZ91A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 270 to 490
63
Elastic (Young's, Tensile) Modulus, GPa 180
46
Elongation at Break, % 1.1 to 13
5.0
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 62 to 69
18
Tensile Strength: Ultimate (UTS), MPa 860 to 1800
240
Tensile Strength: Yield (Proof), MPa 560 to 1460
160

Thermal Properties

Latent Heat of Fusion, J/g 280
360
Melting Completion (Liquidus), °C 1380
600
Melting Onset (Solidus), °C 1340
470
Specific Heat Capacity, J/kg-K 490
990
Thermal Conductivity, W/m-K 42
73
Thermal Expansion, µm/m-K 13
26

Otherwise Unclassified Properties

Base Metal Price, % relative 2.9
12
Density, g/cm3 7.5
1.7
Embodied Carbon, kg CO2/kg material 1.8
22
Embodied Energy, MJ/kg 25
160
Embodied Water, L/kg 48
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19 to 95
11
Resilience: Unit (Modulus of Resilience), kJ/m3 880 to 3970
280
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 25
69
Strength to Weight: Axial, points 32 to 66
38
Strength to Weight: Bending, points 27 to 44
49
Thermal Diffusivity, mm2/s 11
42
Thermal Shock Resistance, points 25 to 53
14

Alloy Composition

Aluminum (Al), % 0 to 0.050
8.3 to 9.7
Arsenic (As), % 0 to 0.020
0
Carbon (C), % 3.4 to 3.8
0
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 0 to 0.8
0 to 0.1
Iron (Fe), % 89.6 to 94
0
Magnesium (Mg), % 0 to 0.040
88.2 to 91.2
Manganese (Mn), % 0.3 to 0.4
0.13 to 0.5
Molybdenum (Mo), % 0 to 0.3
0
Nickel (Ni), % 0 to 2.0
0 to 0.030
Phosphorus (P), % 0 to 0.040
0
Selenium (Se), % 0 to 0.030
0
Silicon (Si), % 2.3 to 2.7
0 to 0.5
Sulfur (S), % 0 to 0.020
0
Tin (Sn), % 0 to 0.020
0
Vanadium (V), % 0 to 0.1
0
Zinc (Zn), % 0
0.35 to 1.0