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R30155 Cobalt vs. 2195 Aluminum

R30155 cobalt belongs to the iron alloys classification, while 2195 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 2195 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
69
Elongation at Break, % 34
9.3
Fatigue Strength, MPa 310
190
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 81
26
Shear Strength, MPa 570
350
Tensile Strength: Ultimate (UTS), MPa 850
590
Tensile Strength: Yield (Proof), MPa 390
560

Thermal Properties

Latent Heat of Fusion, J/g 300
390
Maximum Temperature: Mechanical, °C 1100
210
Melting Completion (Liquidus), °C 1470
660
Melting Onset (Solidus), °C 1420
550
Specific Heat Capacity, J/kg-K 450
900
Thermal Conductivity, W/m-K 12
130
Thermal Expansion, µm/m-K 14
23

Otherwise Unclassified Properties

Base Metal Price, % relative 80
31
Density, g/cm3 8.5
3.0
Embodied Carbon, kg CO2/kg material 9.7
8.6
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 300
1470

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
54
Resilience: Unit (Modulus of Resilience), kJ/m3 370
2290
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
46
Strength to Weight: Axial, points 28
55
Strength to Weight: Bending, points 24
53
Thermal Diffusivity, mm2/s 3.2
49
Thermal Shock Resistance, points 21
26

Alloy Composition

Aluminum (Al), % 0
91.9 to 94.9
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
3.7 to 4.3
Iron (Fe), % 24.3 to 36.2
0 to 0.15
Lithium (Li), % 0
0.8 to 1.2
Magnesium (Mg), % 0
0.25 to 0.8
Manganese (Mn), % 1.0 to 2.0
0 to 0.25
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 to 0.12
Silver (Ag), % 0
0.25 to 0.6
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 0.25
Zirconium (Zr), % 0
0.080 to 0.16
Residuals, % 0
0 to 0.15