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7178 Aluminum vs. Austempered Cast Iron

7178 aluminum belongs to the aluminum alloys classification, while austempered cast iron belongs to the iron alloys. There are 25 material properties with values for both materials. Properties with values for just one material (6, 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 7178 aluminum and the bottom bar is austempered cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
180
Elongation at Break, % 4.5 to 12
1.1 to 13
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
62 to 69
Tensile Strength: Ultimate (UTS), MPa 240 to 640
860 to 1800
Tensile Strength: Yield (Proof), MPa 120 to 560
560 to 1460

Thermal Properties

Latent Heat of Fusion, J/g 370
280
Melting Completion (Liquidus), °C 630
1380
Melting Onset (Solidus), °C 480
1340
Specific Heat Capacity, J/kg-K 860
490
Thermal Conductivity, W/m-K 130
42
Thermal Expansion, µm/m-K 23
13

Otherwise Unclassified Properties

Base Metal Price, % relative 10
2.9
Density, g/cm3 3.1
7.5
Embodied Carbon, kg CO2/kg material 8.2
1.8
Embodied Energy, MJ/kg 150
25
Embodied Water, L/kg 1110
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
19 to 95
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
880 to 3970
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
25
Strength to Weight: Axial, points 21 to 58
32 to 66
Strength to Weight: Bending, points 28 to 54
27 to 44
Thermal Diffusivity, mm2/s 47
11
Thermal Shock Resistance, points 10 to 28
25 to 53

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0 to 0.050
Arsenic (As), % 0
0 to 0.020
Carbon (C), % 0
3.4 to 3.8
Chromium (Cr), % 0.18 to 0.28
0 to 0.1
Copper (Cu), % 1.6 to 2.4
0 to 0.8
Iron (Fe), % 0 to 0.5
89.6 to 94
Magnesium (Mg), % 2.4 to 3.1
0 to 0.040
Manganese (Mn), % 0 to 0.3
0.3 to 0.4
Molybdenum (Mo), % 0
0 to 0.3
Nickel (Ni), % 0
0 to 2.0
Phosphorus (P), % 0
0 to 0.040
Selenium (Se), % 0
0 to 0.030
Silicon (Si), % 0 to 0.4
2.3 to 2.7
Sulfur (S), % 0
0 to 0.020
Tin (Sn), % 0
0 to 0.020
Titanium (Ti), % 0 to 0.2
0
Vanadium (V), % 0
0 to 0.1
Zinc (Zn), % 6.3 to 7.3
0
Residuals, % 0 to 0.15
0