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Nickel 690 vs. 5251 Aluminum

Nickel 690 belongs to the nickel alloys classification, while 5251 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 5251 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 90
44 to 79
Elastic (Young's, Tensile) Modulus, GPa 200
68
Elongation at Break, % 3.4 to 34
2.0 to 19
Fatigue Strength, MPa 180 to 300
59 to 110
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 79
26
Shear Strength, MPa 420 to 570
110 to 160
Tensile Strength: Ultimate (UTS), MPa 640 to 990
180 to 280
Tensile Strength: Yield (Proof), MPa 250 to 760
67 to 250

Thermal Properties

Latent Heat of Fusion, J/g 320
400
Maximum Temperature: Mechanical, °C 1010
180
Melting Completion (Liquidus), °C 1380
650
Melting Onset (Solidus), °C 1340
610
Specific Heat Capacity, J/kg-K 470
900
Thermal Conductivity, W/m-K 14
150
Thermal Expansion, µm/m-K 14
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.5
37
Electrical Conductivity: Equal Weight (Specific), % IACS 1.6
120

Otherwise Unclassified Properties

Base Metal Price, % relative 50
9.5
Density, g/cm3 8.3
2.7
Embodied Carbon, kg CO2/kg material 8.2
8.5
Embodied Energy, MJ/kg 120
150
Embodied Water, L/kg 290
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31 to 170
5.4 to 27
Resilience: Unit (Modulus of Resilience), kJ/m3 160 to 1440
33 to 450
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
50
Strength to Weight: Axial, points 21 to 33
18 to 29
Strength to Weight: Bending, points 20 to 27
26 to 35
Thermal Diffusivity, mm2/s 3.5
61
Thermal Shock Resistance, points 16 to 25
7.9 to 13

Alloy Composition

Aluminum (Al), % 0
95.5 to 98.2
Carbon (C), % 0 to 0.050
0
Chromium (Cr), % 27 to 31
0 to 0.15
Copper (Cu), % 0 to 0.5
0 to 0.15
Iron (Fe), % 7.0 to 11
0 to 0.5
Magnesium (Mg), % 0
1.7 to 2.4
Manganese (Mn), % 0 to 0.5
0.1 to 0.5
Nickel (Ni), % 58 to 66
0
Silicon (Si), % 0 to 0.5
0 to 0.4
Sulfur (S), % 0 to 0.015
0
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 0
0 to 0.15
Residuals, % 0
0 to 0.15

Comparable Variants