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R05400 Tantalum vs. R30012 Cobalt

R05400 tantalum belongs to the otherwise unclassified metals classification, while R30012 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.

For each property being compared, the top bar is R05400 tantalum and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 1.1 to 28
1.0
Poisson's Ratio 0.34
0.28
Shear Modulus, GPa 69
86
Tensile Strength: Ultimate (UTS), MPa 210 to 540
830
Tensile Strength: Yield (Proof), MPa 140 to 390
650

Thermal Properties

Latent Heat of Fusion, J/g 140
320
Specific Heat Capacity, J/kg-K 140
440
Thermal Conductivity, W/m-K 59
15
Thermal Expansion, µm/m-K 6.5
12

Otherwise Unclassified Properties

Density, g/cm3 17
8.8
Embodied Water, L/kg 650
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.5 to 53
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 50 to 420
960
Stiffness to Weight: Axial, points 6.2
14
Stiffness to Weight: Bending, points 11
23
Strength to Weight: Axial, points 3.6 to 9.0
26
Strength to Weight: Bending, points 4.8 to 8.8
22
Thermal Diffusivity, mm2/s 25
3.8
Thermal Shock Resistance, points 13 to 32
23

Alloy Composition

Carbon (C), % 0 to 0.010
1.4 to 2.0
Chromium (Cr), % 0
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Hydrogen (H), % 0 to 0.0015
0
Iron (Fe), % 0 to 0.010
0 to 3.0
Molybdenum (Mo), % 0 to 0.020
0 to 1.0
Nickel (Ni), % 0 to 0.010
0 to 3.0
Niobium (Nb), % 0 to 0.1
0
Nitrogen (N), % 0 to 0.010
0
Oxygen (O), % 0 to 0.030
0
Silicon (Si), % 0 to 0.0050
0 to 2.0
Tantalum (Ta), % 99.7 to 100
0
Titanium (Ti), % 0 to 0.010
0
Tungsten (W), % 0 to 0.050
7.5 to 9.5