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6081 Aluminum vs. AWS BNi-8

6081 aluminum belongs to the aluminum alloys classification, while AWS BNi-8 belongs to the nickel alloys. There are 19 material properties with values for both materials. Properties with values for just one material (12, 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 AWS BNi-8.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
180
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 26
67
Tensile Strength: Ultimate (UTS), MPa 310
570

Thermal Properties

Latent Heat of Fusion, J/g 410
390
Melting Completion (Liquidus), °C 640
1010
Melting Onset (Solidus), °C 610
980
Specific Heat Capacity, J/kg-K 900
480
Thermal Expansion, µm/m-K 23
13

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
46
Density, g/cm3 2.7
7.9
Embodied Carbon, kg CO2/kg material 8.3
8.2
Embodied Energy, MJ/kg 150
120
Embodied Water, L/kg 1180
220

Common Calculations

Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 32
20
Strength to Weight: Bending, points 37
19
Thermal Shock Resistance, points 14
17

Alloy Composition

Aluminum (Al), % 96.3 to 98.6
0 to 0.050
Carbon (C), % 0
0 to 0.060
Chromium (Cr), % 0 to 0.1
0
Cobalt (Co), % 0
0 to 0.1
Copper (Cu), % 0 to 0.1
4.0 to 5.0
Iron (Fe), % 0 to 0.5
0
Magnesium (Mg), % 0.6 to 1.0
0
Manganese (Mn), % 0.1 to 0.45
21.5 to 24.5
Nickel (Ni), % 0
61.6 to 68.5
Phosphorus (P), % 0
0 to 0.020
Selenium (Se), % 0
0 to 0.0050
Silicon (Si), % 0.7 to 1.1
6.0 to 8.0
Sulfur (S), % 0
0 to 0.020
Titanium (Ti), % 0 to 0.15
0 to 0.050
Zinc (Zn), % 0 to 0.2
0
Zirconium (Zr), % 0
0 to 0.050
Residuals, % 0
0 to 0.5