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Austempered Cast Iron vs. AZ63A Magnesium

Austempered cast iron belongs to the iron alloys classification, while AZ63A magnesium belongs to the magnesium alloys. There are 25 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 AZ63A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
46
Elongation at Break, % 1.1 to 13
2.2 to 8.0
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 62 to 69
18
Tensile Strength: Ultimate (UTS), MPa 860 to 1800
190 to 270
Tensile Strength: Yield (Proof), MPa 560 to 1460
81 to 120

Thermal Properties

Latent Heat of Fusion, J/g 280
350
Melting Completion (Liquidus), °C 1380
610
Melting Onset (Solidus), °C 1340
450
Specific Heat Capacity, J/kg-K 490
980
Thermal Conductivity, W/m-K 42
52 to 65
Thermal Expansion, µm/m-K 13
26

Otherwise Unclassified Properties

Base Metal Price, % relative 2.9
12
Density, g/cm3 7.5
1.8
Embodied Carbon, kg CO2/kg material 1.8
22
Embodied Energy, MJ/kg 25
150
Embodied Water, L/kg 48
970

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19 to 95
3.7 to 16
Resilience: Unit (Modulus of Resilience), kJ/m3 880 to 3970
71 to 160
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
66
Strength to Weight: Axial, points 32 to 66
29 to 41
Strength to Weight: Bending, points 27 to 44
40 to 51
Thermal Diffusivity, mm2/s 11
29 to 37
Thermal Shock Resistance, points 25 to 53
11 to 16

Alloy Composition

Aluminum (Al), % 0 to 0.050
5.3 to 6.7
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 0.25
Iron (Fe), % 89.6 to 94
0
Magnesium (Mg), % 0 to 0.040
88.6 to 92.1
Manganese (Mn), % 0.3 to 0.4
0.15 to 0.35
Molybdenum (Mo), % 0 to 0.3
0
Nickel (Ni), % 0 to 2.0
0 to 0.010
Phosphorus (P), % 0 to 0.040
0
Selenium (Se), % 0 to 0.030
0
Silicon (Si), % 2.3 to 2.7
0 to 0.3
Sulfur (S), % 0 to 0.020
0
Tin (Sn), % 0 to 0.020
0
Vanadium (V), % 0 to 0.1
0
Zinc (Zn), % 0
2.5 to 3.5
Residuals, % 0
0 to 0.3