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R31538 Cobalt vs. R05400 Tantalum

R31538 cobalt belongs to the cobalt alloys classification, while R05400 tantalum belongs to the otherwise unclassified metals. 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 R31538 cobalt and the bottom bar is R05400 tantalum.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

Carbon (C), % 0.15 to 0.35
0 to 0.010
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 58.7 to 68.9
0
Hydrogen (H), % 0
0 to 0.0015
Iron (Fe), % 0 to 0.75
0 to 0.010
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 5.0 to 7.0
0 to 0.020
Nickel (Ni), % 0 to 1.0
0 to 0.010
Niobium (Nb), % 0
0 to 0.1
Nitrogen (N), % 0 to 0.25
0 to 0.010
Oxygen (O), % 0
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.0050
Tantalum (Ta), % 0
99.7 to 100
Titanium (Ti), % 0
0 to 0.010
Tungsten (W), % 0
0 to 0.050

Comparable Variants