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R30075 Cobalt vs. 2195 Aluminum

R30075 cobalt belongs to the cobalt alloys classification, while 2195 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 R30075 cobalt and the bottom bar is 2195 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
69
Elongation at Break, % 12
9.3
Fatigue Strength, MPa 250 to 840
190
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 82 to 98
26
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
590
Tensile Strength: Yield (Proof), MPa 480 to 840
560

Thermal Properties

Latent Heat of Fusion, J/g 320
390
Melting Completion (Liquidus), °C 1360
660
Melting Onset (Solidus), °C 1290
550
Specific Heat Capacity, J/kg-K 450
900
Thermal Conductivity, W/m-K 13
130
Thermal Expansion, µm/m-K 12
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
34
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
100

Otherwise Unclassified Properties

Density, g/cm3 8.4
3.0
Embodied Carbon, kg CO2/kg material 8.1
8.6
Embodied Energy, MJ/kg 110
160
Embodied Water, L/kg 530
1470

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 140
54
Resilience: Unit (Modulus of Resilience), kJ/m3 560 to 1410
2290
Stiffness to Weight: Axial, points 14 to 17
13
Stiffness to Weight: Bending, points 24 to 25
46
Strength to Weight: Axial, points 26 to 42
55
Strength to Weight: Bending, points 22 to 31
53
Thermal Diffusivity, mm2/s 3.5
49
Thermal Shock Resistance, points 21 to 29
26

Alloy Composition

Aluminum (Al), % 0 to 0.1
91.9 to 94.9
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.35
0
Chromium (Cr), % 27 to 30
0
Cobalt (Co), % 58.7 to 68
0
Copper (Cu), % 0
3.7 to 4.3
Iron (Fe), % 0 to 0.75
0 to 0.15
Lithium (Li), % 0
0.8 to 1.2
Magnesium (Mg), % 0
0.25 to 0.8
Manganese (Mn), % 0 to 1.0
0 to 0.25
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 0.5
0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.020
0
Silicon (Si), % 0 to 1.0
0 to 0.12
Silver (Ag), % 0
0.25 to 0.6
Sulfur (S), % 0 to 0.010
0
Titanium (Ti), % 0 to 0.1
0 to 0.1
Tungsten (W), % 0 to 0.2
0
Zinc (Zn), % 0
0 to 0.25
Zirconium (Zr), % 0
0.080 to 0.16
Residuals, % 0
0 to 0.15