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6081 Aluminum vs. Nickel 718

6081 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 6081 aluminum and the bottom bar is nickel 718.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
190
Elongation at Break, % 9.0
12 to 50
Fatigue Strength, MPa 110
460 to 760
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
75
Shear Strength, MPa 180
660 to 950
Tensile Strength: Ultimate (UTS), MPa 310
930 to 1530
Tensile Strength: Yield (Proof), MPa 270
510 to 1330

Thermal Properties

Latent Heat of Fusion, J/g 410
310
Maximum Temperature: Mechanical, °C 160
980
Melting Completion (Liquidus), °C 640
1340
Melting Onset (Solidus), °C 610
1260
Specific Heat Capacity, J/kg-K 900
450
Thermal Conductivity, W/m-K 180
11
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 47
1.4
Electrical Conductivity: Equal Weight (Specific), % IACS 160
1.5

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
75
Density, g/cm3 2.7
8.3
Embodied Carbon, kg CO2/kg material 8.3
13
Embodied Energy, MJ/kg 150
190
Embodied Water, L/kg 1180
250

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27
140 to 390
Resilience: Unit (Modulus of Resilience), kJ/m3 540
660 to 4560
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
23
Strength to Weight: Axial, points 32
31 to 51
Strength to Weight: Bending, points 37
25 to 35
Thermal Diffusivity, mm2/s 74
3.0
Thermal Shock Resistance, points 14
27 to 44

Alloy Composition

Aluminum (Al), % 96.3 to 98.6
0.2 to 0.8
Boron (B), % 0
0 to 0.0060
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0 to 0.1
17 to 21
Cobalt (Co), % 0
0 to 1.0
Copper (Cu), % 0 to 0.1
0 to 0.3
Iron (Fe), % 0 to 0.5
11.1 to 24.6
Magnesium (Mg), % 0.6 to 1.0
0
Manganese (Mn), % 0.1 to 0.45
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), % 0.7 to 1.1
0 to 0.35
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.15
0.65 to 1.2
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0