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7178 Aluminum vs. Grade CY40 Nickel

7178 aluminum belongs to the aluminum alloys classification, while grade CY40 nickel belongs to the nickel alloys. There are 29 material properties with values for both materials. Properties with values for just one material (1, 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 grade CY40 nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 4.5 to 12
34
Fatigue Strength, MPa 120 to 210
160
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
74
Tensile Strength: Ultimate (UTS), MPa 240 to 640
540
Tensile Strength: Yield (Proof), MPa 120 to 560
220

Thermal Properties

Latent Heat of Fusion, J/g 370
330
Maximum Temperature: Mechanical, °C 180
960
Melting Completion (Liquidus), °C 630
1350
Melting Onset (Solidus), °C 480
1300
Specific Heat Capacity, J/kg-K 860
470
Thermal Conductivity, W/m-K 130
14
Thermal Expansion, µm/m-K 23
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 91
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 10
55
Density, g/cm3 3.1
8.4
Embodied Carbon, kg CO2/kg material 8.2
9.1
Embodied Energy, MJ/kg 150
130
Embodied Water, L/kg 1110
260

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
150
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
130
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
23
Strength to Weight: Axial, points 21 to 58
18
Strength to Weight: Bending, points 28 to 54
18
Thermal Diffusivity, mm2/s 47
3.7
Thermal Shock Resistance, points 10 to 28
16

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0
Carbon (C), % 0
0 to 0.4
Chromium (Cr), % 0.18 to 0.28
14 to 17
Copper (Cu), % 1.6 to 2.4
0
Iron (Fe), % 0 to 0.5
0 to 11
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0 to 1.5
Nickel (Ni), % 0
67 to 86
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.4
0 to 3.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
0
Residuals, % 0 to 0.15
0