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R30155 Cobalt vs. 4147 Aluminum

R30155 cobalt belongs to the iron alloys classification, while 4147 aluminum belongs to the aluminum alloys. There are 28 material properties with values for both materials. Properties with values for just one material (7, 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 4147 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
72
Elongation at Break, % 34
3.3
Fatigue Strength, MPa 310
42
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 81
27
Shear Strength, MPa 570
63
Tensile Strength: Ultimate (UTS), MPa 850
110
Tensile Strength: Yield (Proof), MPa 390
59

Thermal Properties

Latent Heat of Fusion, J/g 300
570
Maximum Temperature: Mechanical, °C 1100
160
Melting Completion (Liquidus), °C 1470
580
Melting Onset (Solidus), °C 1420
560
Specific Heat Capacity, J/kg-K 450
900
Thermal Conductivity, W/m-K 12
130
Thermal Expansion, µm/m-K 14
21

Otherwise Unclassified Properties

Base Metal Price, % relative 80
9.5
Density, g/cm3 8.5
2.5
Embodied Carbon, kg CO2/kg material 9.7
7.7
Embodied Energy, MJ/kg 150
140
Embodied Water, L/kg 300
1050

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
3.1
Resilience: Unit (Modulus of Resilience), kJ/m3 370
24
Stiffness to Weight: Axial, points 14
16
Stiffness to Weight: Bending, points 23
55
Strength to Weight: Axial, points 28
12
Strength to Weight: Bending, points 24
20
Thermal Diffusivity, mm2/s 3.2
58
Thermal Shock Resistance, points 21
5.2

Alloy Composition

Aluminum (Al), % 0
85 to 88.9
Beryllium (Be), % 0
0 to 0.00030
Carbon (C), % 0.080 to 0.16
0
Chromium (Cr), % 20 to 22.5
0
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 24.3 to 36.2
0 to 0.8
Magnesium (Mg), % 0
0.1 to 0.5
Manganese (Mn), % 1.0 to 2.0
0 to 0.1
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
11 to 13
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0
0 to 0.15