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R30155 Cobalt vs. 4007 Aluminum

R30155 cobalt belongs to the iron alloys classification, while 4007 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 4007 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
32 to 44
Elastic (Young's, Tensile) Modulus, GPa 210
71
Elongation at Break, % 34
5.1 to 23
Fatigue Strength, MPa 310
46 to 88
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 81
27
Shear Strength, MPa 570
80 to 90
Tensile Strength: Ultimate (UTS), MPa 850
130 to 160
Tensile Strength: Yield (Proof), MPa 390
50 to 120

Thermal Properties

Latent Heat of Fusion, J/g 300
410
Maximum Temperature: Mechanical, °C 1100
170
Melting Completion (Liquidus), °C 1470
650
Melting Onset (Solidus), °C 1420
590
Specific Heat Capacity, J/kg-K 450
890
Thermal Conductivity, W/m-K 12
170
Thermal Expansion, µm/m-K 14
23

Otherwise Unclassified Properties

Base Metal Price, % relative 80
9.5
Density, g/cm3 8.5
2.8
Embodied Carbon, kg CO2/kg material 9.7
8.1
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 300
1160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
7.4 to 23
Resilience: Unit (Modulus of Resilience), kJ/m3 370
18 to 110
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
49
Strength to Weight: Axial, points 28
12 to 15
Strength to Weight: Bending, points 24
20 to 23
Thermal Diffusivity, mm2/s 3.2
67
Thermal Shock Resistance, points 21
5.5 to 6.7

Alloy Composition

Aluminum (Al), % 0
94.1 to 97.6
Carbon (C), % 0.080 to 0.16
0
Chromium (Cr), % 20 to 22.5
0.050 to 0.25
Cobalt (Co), % 18.5 to 21
0 to 0.050
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 24.3 to 36.2
0.4 to 1.0
Magnesium (Mg), % 0
0 to 0.2
Manganese (Mn), % 1.0 to 2.0
0.8 to 1.5
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
0.15 to 0.7
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
1.0 to 1.7
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 0.75 to 1.3
0
Titanium (Ti), % 0
0 to 0.1
Tungsten (W), % 2.0 to 3.0
0
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15