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Nickel 690 vs. 2018 Aluminum

Nickel 690 belongs to the nickel alloys classification, while 2018 aluminum belongs to the aluminum alloys. 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 nickel 690 and the bottom bar is 2018 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 90
120
Elastic (Young's, Tensile) Modulus, GPa 200
73
Elongation at Break, % 3.4 to 34
9.6
Fatigue Strength, MPa 180 to 300
120
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 79
27
Shear Strength, MPa 420 to 570
270
Tensile Strength: Ultimate (UTS), MPa 640 to 990
420
Tensile Strength: Yield (Proof), MPa 250 to 760
310

Thermal Properties

Latent Heat of Fusion, J/g 320
390
Maximum Temperature: Mechanical, °C 1010
220
Melting Completion (Liquidus), °C 1380
640
Melting Onset (Solidus), °C 1340
510
Specific Heat Capacity, J/kg-K 470
870
Thermal Conductivity, W/m-K 14
150
Thermal Expansion, µm/m-K 14
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.5
40
Electrical Conductivity: Equal Weight (Specific), % IACS 1.6
120

Otherwise Unclassified Properties

Base Metal Price, % relative 50
11
Density, g/cm3 8.3
3.1
Embodied Carbon, kg CO2/kg material 8.2
8.1
Embodied Energy, MJ/kg 120
150
Embodied Water, L/kg 290
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31 to 170
37
Resilience: Unit (Modulus of Resilience), kJ/m3 160 to 1440
670
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
45
Strength to Weight: Axial, points 21 to 33
38
Strength to Weight: Bending, points 20 to 27
41
Thermal Diffusivity, mm2/s 3.5
57
Thermal Shock Resistance, points 16 to 25
19

Alloy Composition

Aluminum (Al), % 0
89.7 to 94.4
Carbon (C), % 0 to 0.050
0
Chromium (Cr), % 27 to 31
0 to 0.1
Copper (Cu), % 0 to 0.5
3.5 to 4.5
Iron (Fe), % 7.0 to 11
0 to 1.0
Magnesium (Mg), % 0
0.45 to 0.9
Manganese (Mn), % 0 to 0.5
0 to 0.2
Nickel (Ni), % 58 to 66
1.7 to 2.3
Silicon (Si), % 0 to 0.5
0 to 0.9
Sulfur (S), % 0 to 0.015
0
Zinc (Zn), % 0
0 to 0.25
Residuals, % 0
0 to 0.15