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6023 Aluminum vs. R31538 Cobalt

6023 aluminum belongs to the aluminum alloys classification, while R31538 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (5, 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 6023 aluminum and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
220
Elongation at Break, % 11
13 to 23
Fatigue Strength, MPa 120 to 130
310 to 480
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
86
Tensile Strength: Ultimate (UTS), MPa 360
1020 to 1360
Tensile Strength: Yield (Proof), MPa 300 to 310
580 to 930

Thermal Properties

Latent Heat of Fusion, J/g 400
320
Melting Completion (Liquidus), °C 640
1360
Melting Onset (Solidus), °C 580
1290
Specific Heat Capacity, J/kg-K 890
450
Thermal Conductivity, W/m-K 170
13
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 45
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 140
2.1

Otherwise Unclassified Properties

Density, g/cm3 2.8
8.4
Embodied Carbon, kg CO2/kg material 8.3
8.1
Embodied Energy, MJ/kg 150
110
Embodied Water, L/kg 1180
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 38 to 39
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 670 to 690
750 to 1920
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 49
24
Strength to Weight: Axial, points 35 to 36
34 to 45
Strength to Weight: Bending, points 40
27 to 32
Thermal Diffusivity, mm2/s 67
3.5
Thermal Shock Resistance, points 16
25 to 33

Alloy Composition

Aluminum (Al), % 94 to 97.7
0
Bismuth (Bi), % 0.3 to 0.8
0
Carbon (C), % 0
0.15 to 0.35
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Copper (Cu), % 0.2 to 0.5
0
Iron (Fe), % 0 to 0.5
0 to 0.75
Magnesium (Mg), % 0.4 to 0.9
0
Manganese (Mn), % 0.2 to 0.6
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Silicon (Si), % 0.6 to 1.4
0 to 1.0
Tin (Sn), % 0.6 to 1.2
0
Residuals, % 0 to 0.15
0