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8021 Aluminum vs. Nickel 684

8021 aluminum belongs to the aluminum alloys classification, while nickel 684 belongs to the nickel alloys. There are 25 material properties with values for both materials. Properties with values for just one material (7, 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 8021 aluminum and the bottom bar is nickel 684.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 2.3
11
Fatigue Strength, MPa 61
390
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
76
Tensile Strength: Ultimate (UTS), MPa 160
1190
Tensile Strength: Yield (Proof), MPa 130
800

Thermal Properties

Latent Heat of Fusion, J/g 400
320
Maximum Temperature: Mechanical, °C 170
1000
Melting Completion (Liquidus), °C 650
1370
Melting Onset (Solidus), °C 640
1320
Specific Heat Capacity, J/kg-K 900
470
Thermal Expansion, µm/m-K 23
13

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
75
Density, g/cm3 2.8
8.3
Embodied Carbon, kg CO2/kg material 8.1
10
Embodied Energy, MJ/kg 150
140
Embodied Water, L/kg 1180
360

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.4
120
Resilience: Unit (Modulus of Resilience), kJ/m3 130
1610
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 49
23
Strength to Weight: Axial, points 16
40
Strength to Weight: Bending, points 23
30
Thermal Shock Resistance, points 7.0
34

Alloy Composition

Aluminum (Al), % 98 to 98.8
2.5 to 3.3
Boron (B), % 0
0.0030 to 0.010
Carbon (C), % 0
0 to 0.15
Chromium (Cr), % 0
15 to 20
Cobalt (Co), % 0
13 to 20
Copper (Cu), % 0 to 0.050
0 to 0.15
Iron (Fe), % 1.2 to 1.7
0 to 4.0
Manganese (Mn), % 0
0 to 0.75
Molybdenum (Mo), % 0
3.0 to 5.0
Nickel (Ni), % 0
42.7 to 64
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 0.15
0 to 0.75
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0
2.5 to 3.3
Residuals, % 0 to 0.15
0