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R30155 Cobalt vs. 2025 Aluminum

R30155 cobalt belongs to the iron alloys classification, while 2025 aluminum belongs to the aluminum alloys. There are 29 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 R30155 cobalt and the bottom bar is 2025 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
110
Elastic (Young's, Tensile) Modulus, GPa 210
72
Elongation at Break, % 34
15
Fatigue Strength, MPa 310
130
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 81
27
Shear Strength, MPa 570
240
Tensile Strength: Ultimate (UTS), MPa 850
400
Tensile Strength: Yield (Proof), MPa 390
260

Thermal Properties

Latent Heat of Fusion, J/g 300
400
Maximum Temperature: Mechanical, °C 1100
190
Melting Completion (Liquidus), °C 1470
640
Melting Onset (Solidus), °C 1420
520
Specific Heat Capacity, J/kg-K 450
870
Thermal Conductivity, W/m-K 12
150
Thermal Expansion, µm/m-K 14
23

Otherwise Unclassified Properties

Base Metal Price, % relative 80
10
Density, g/cm3 8.5
3.0
Embodied Carbon, kg CO2/kg material 9.7
7.9
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 300
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
55
Resilience: Unit (Modulus of Resilience), kJ/m3 370
450
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
46
Strength to Weight: Axial, points 28
37
Strength to Weight: Bending, points 24
40
Thermal Diffusivity, mm2/s 3.2
58
Thermal Shock Resistance, points 21
18

Alloy Composition

Aluminum (Al), % 0
90.9 to 95.2
Carbon (C), % 0.080 to 0.16
0
Chromium (Cr), % 20 to 22.5
0 to 0.1
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
3.9 to 5.0
Iron (Fe), % 24.3 to 36.2
0 to 1.0
Magnesium (Mg), % 0
0 to 0.050
Manganese (Mn), % 1.0 to 2.0
0.4 to 1.2
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
0
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0.5 to 1.2
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 0.75 to 1.3
0
Titanium (Ti), % 0
0 to 0.15
Tungsten (W), % 2.0 to 3.0
0
Zinc (Zn), % 0
0 to 0.25
Residuals, % 0
0 to 0.15