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7178 Aluminum vs. R30556 Alloy

7178 aluminum belongs to the aluminum alloys classification, while R30556 alloy belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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 R30556 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
210
Elongation at Break, % 4.5 to 12
45
Fatigue Strength, MPa 120 to 210
320
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 27
81
Shear Strength, MPa 140 to 380
550
Tensile Strength: Ultimate (UTS), MPa 240 to 640
780
Tensile Strength: Yield (Proof), MPa 120 to 560
350

Thermal Properties

Latent Heat of Fusion, J/g 370
300
Maximum Temperature: Mechanical, °C 180
1100
Melting Completion (Liquidus), °C 630
1420
Melting Onset (Solidus), °C 480
1330
Specific Heat Capacity, J/kg-K 860
450
Thermal Conductivity, W/m-K 130
11
Thermal Expansion, µm/m-K 23
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 91
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 10
70
Density, g/cm3 3.1
8.4
Embodied Carbon, kg CO2/kg material 8.2
8.7
Embodied Energy, MJ/kg 150
130
Embodied Water, L/kg 1110
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
290
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
290
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
23
Strength to Weight: Axial, points 21 to 58
26
Strength to Weight: Bending, points 28 to 54
22
Thermal Diffusivity, mm2/s 47
2.9
Thermal Shock Resistance, points 10 to 28
18

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0.1 to 0.5
Boron (B), % 0
0 to 0.020
Carbon (C), % 0
0.050 to 0.15
Chromium (Cr), % 0.18 to 0.28
21 to 23
Cobalt (Co), % 0
16 to 21
Copper (Cu), % 1.6 to 2.4
0
Iron (Fe), % 0 to 0.5
20.4 to 38.2
Lanthanum (La), % 0
0.0050 to 0.1
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0.5 to 2.0
Molybdenum (Mo), % 0
2.5 to 4.0
Nickel (Ni), % 0
19 to 22.5
Niobium (Nb), % 0
0 to 0.3
Nitrogen (N), % 0
0.1 to 0.3
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.4
0.2 to 0.8
Sulfur (S), % 0
0 to 0.015
Tantalum (Ta), % 0
0.3 to 1.3
Titanium (Ti), % 0 to 0.2
0
Tungsten (W), % 0
2.0 to 3.5
Zinc (Zn), % 6.3 to 7.3
0.0010 to 0.1
Residuals, % 0 to 0.15
0