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R30021 Cobalt vs. 5088 Aluminum

R30021 cobalt belongs to the cobalt alloys classification, while 5088 aluminum belongs to the aluminum 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 R30021 cobalt and the bottom bar is 5088 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
68
Elongation at Break, % 9.0
29
Fatigue Strength, MPa 250
180
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 86
25
Tensile Strength: Ultimate (UTS), MPa 700
310
Tensile Strength: Yield (Proof), MPa 500
150

Thermal Properties

Latent Heat of Fusion, J/g 330
390
Melting Completion (Liquidus), °C 1350
640
Melting Onset (Solidus), °C 1190
540
Specific Heat Capacity, J/kg-K 450
900
Thermal Conductivity, W/m-K 15
120
Thermal Expansion, µm/m-K 11
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
29
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
98

Otherwise Unclassified Properties

Density, g/cm3 8.4
2.7
Embodied Carbon, kg CO2/kg material 8.0
9.0
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 520
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
76
Resilience: Unit (Modulus of Resilience), kJ/m3 570
170
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
50
Strength to Weight: Axial, points 23
32
Strength to Weight: Bending, points 21
38
Thermal Diffusivity, mm2/s 3.8
51
Thermal Shock Resistance, points 21
14

Alloy Composition


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Aluminum (Al), % 0
92.4 to 94.8
Carbon (C), % 0.2 to 0.35
0
Chromium (Cr), % 26 to 29
0 to 0.15
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 3.0
0.1 to 0.35
Magnesium (Mg), % 0
4.7 to 5.5
Manganese (Mn), % 0
0.2 to 0.5
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
0
Silicon (Si), % 0 to 1.5
0 to 0.2
Zinc (Zn), % 0
0.2 to 0.4
Zirconium (Zr), % 0
0 to 0.15
Residuals, % 0
0 to 0.15