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7178 Aluminum vs. AWS ERNiCrMo-3

7178 aluminum belongs to the aluminum alloys classification, while AWS ERNiCrMo-3 belongs to the nickel alloys. There are 24 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 AWS ERNiCrMo-3.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 4.5 to 12
34
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
79
Tensile Strength: Ultimate (UTS), MPa 240 to 640
870

Thermal Properties

Latent Heat of Fusion, J/g 370
330
Melting Completion (Liquidus), °C 630
1480
Melting Onset (Solidus), °C 480
1430
Specific Heat Capacity, J/kg-K 860
440
Thermal Conductivity, W/m-K 130
11
Thermal Expansion, µm/m-K 23
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
1.3
Electrical Conductivity: Equal Weight (Specific), % IACS 91
1.4

Otherwise Unclassified Properties

Base Metal Price, % relative 10
80
Density, g/cm3 3.1
8.6
Embodied Carbon, kg CO2/kg material 8.2
14
Embodied Energy, MJ/kg 150
190
Embodied Water, L/kg 1110
290

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
23
Strength to Weight: Axial, points 21 to 58
28
Strength to Weight: Bending, points 28 to 54
24
Thermal Diffusivity, mm2/s 47
2.8
Thermal Shock Resistance, points 10 to 28
25

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0 to 0.4
Carbon (C), % 0
0 to 0.010
Chromium (Cr), % 0.18 to 0.28
20 to 23
Copper (Cu), % 1.6 to 2.4
0 to 0.5
Iron (Fe), % 0 to 0.5
0 to 5.0
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0 to 0.5
Molybdenum (Mo), % 0
8.0 to 10
Nickel (Ni), % 0
58 to 68.9
Niobium (Nb), % 0
3.2 to 4.2
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 0.4
0 to 0.5
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.2
0 to 0.4
Zinc (Zn), % 6.3 to 7.3
0
Residuals, % 0
0 to 0.5