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R05200 Tantalum vs. R31538 Cobalt

R05200 tantalum belongs to the otherwise unclassified metals classification, while R31538 cobalt belongs to the cobalt alloys. There are 20 material properties with values for both materials. Properties with values for just one material (9, 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 R05200 tantalum and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 1.1 to 28
13 to 23
Poisson's Ratio 0.34
0.29
Shear Modulus, GPa 69
86
Tensile Strength: Ultimate (UTS), MPa 210 to 540
1020 to 1360
Tensile Strength: Yield (Proof), MPa 140 to 390
580 to 930

Thermal Properties

Latent Heat of Fusion, J/g 140
320
Specific Heat Capacity, J/kg-K 140
450
Thermal Conductivity, W/m-K 59
13
Thermal Expansion, µm/m-K 6.5
13

Otherwise Unclassified Properties

Density, g/cm3 17
8.4
Embodied Water, L/kg 650
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.5 to 53
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 50 to 420
750 to 1920
Stiffness to Weight: Axial, points 6.2
15
Stiffness to Weight: Bending, points 11
24
Strength to Weight: Axial, points 3.6 to 9.0
34 to 45
Strength to Weight: Bending, points 4.8 to 8.8
27 to 32
Thermal Diffusivity, mm2/s 25
3.5
Thermal Shock Resistance, points 13 to 32
25 to 33

Alloy Composition

Carbon (C), % 0 to 0.010
0.15 to 0.35
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Hydrogen (H), % 0 to 0.0015
0
Iron (Fe), % 0 to 0.010
0 to 0.75
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0 to 0.020
5.0 to 7.0
Nickel (Ni), % 0 to 0.010
0 to 1.0
Niobium (Nb), % 0 to 0.1
0
Nitrogen (N), % 0 to 0.010
0 to 0.25
Oxygen (O), % 0 to 0.015
0
Silicon (Si), % 0 to 0.0050
0 to 1.0
Tantalum (Ta), % 99.8 to 100
0
Titanium (Ti), % 0 to 0.010
0
Tungsten (W), % 0 to 0.050
0

Comparable Variants