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7178 Aluminum vs. Nickel 718

7178 aluminum belongs to the aluminum alloys classification, while nickel 718 belongs to the nickel alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 nickel 718.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 4.5 to 12
12 to 50
Fatigue Strength, MPa 120 to 210
460 to 760
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
75
Shear Strength, MPa 140 to 380
660 to 950
Tensile Strength: Ultimate (UTS), MPa 240 to 640
930 to 1530
Tensile Strength: Yield (Proof), MPa 120 to 560
510 to 1330

Thermal Properties

Latent Heat of Fusion, J/g 370
310
Maximum Temperature: Mechanical, °C 180
980
Melting Completion (Liquidus), °C 630
1340
Melting Onset (Solidus), °C 480
1260
Specific Heat Capacity, J/kg-K 860
450
Thermal Conductivity, W/m-K 130
11
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
1.4
Electrical Conductivity: Equal Weight (Specific), % IACS 91
1.5

Otherwise Unclassified Properties

Base Metal Price, % relative 10
75
Density, g/cm3 3.1
8.3
Embodied Carbon, kg CO2/kg material 8.2
13
Embodied Energy, MJ/kg 150
190
Embodied Water, L/kg 1110
250

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
140 to 390
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
660 to 4560
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
23
Strength to Weight: Axial, points 21 to 58
31 to 51
Strength to Weight: Bending, points 28 to 54
25 to 35
Thermal Diffusivity, mm2/s 47
3.0
Thermal Shock Resistance, points 10 to 28
27 to 44

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0.2 to 0.8
Boron (B), % 0
0 to 0.0060
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0.18 to 0.28
17 to 21
Cobalt (Co), % 0
0 to 1.0
Copper (Cu), % 1.6 to 2.4
0 to 0.3
Iron (Fe), % 0 to 0.5
11.1 to 24.6
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0 to 0.35
Molybdenum (Mo), % 0
2.8 to 3.3
Nickel (Ni), % 0
50 to 55
Niobium (Nb), % 0
4.8 to 5.5
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 0.4
0 to 0.35
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.2
0.65 to 1.2
Zinc (Zn), % 6.3 to 7.3
0
Residuals, % 0 to 0.15
0