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R30012 Cobalt vs. R05400 Tantalum

R30012 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.

For each property being compared, the top bar is R30012 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, % 1.0
1.1 to 28
Poisson's Ratio 0.28
0.34
Shear Modulus, GPa 86
69
Tensile Strength: Ultimate (UTS), MPa 830
210 to 540
Tensile Strength: Yield (Proof), MPa 650
140 to 390

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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