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R05400 Tantalum vs. G-CoCr28 Cobalt

R05400 tantalum belongs to the otherwise unclassified metals classification, while G-CoCr28 cobalt belongs to the cobalt alloys. There are 20 material properties with values for both materials. Properties with values for just one material (7, 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 R05400 tantalum and the bottom bar is G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 1.1 to 28
6.7
Poisson's Ratio 0.34
0.28
Shear Modulus, GPa 69
83
Tensile Strength: Ultimate (UTS), MPa 210 to 540
560
Tensile Strength: Yield (Proof), MPa 140 to 390
260

Thermal Properties

Latent Heat of Fusion, J/g 140
320
Specific Heat Capacity, J/kg-K 140
470
Thermal Conductivity, W/m-K 59
8.5
Thermal Expansion, µm/m-K 6.5
14

Otherwise Unclassified Properties

Density, g/cm3 17
8.1
Embodied Water, L/kg 650
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.5 to 53
31
Resilience: Unit (Modulus of Resilience), kJ/m3 50 to 420
160
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
19
Strength to Weight: Bending, points 4.8 to 8.8
19
Thermal Diffusivity, mm2/s 25
2.2
Thermal Shock Resistance, points 13 to 32
14

Alloy Composition

Carbon (C), % 0 to 0.010
0.050 to 0.25
Chromium (Cr), % 0
27 to 30
Cobalt (Co), % 0
48 to 52
Hydrogen (H), % 0 to 0.0015
0
Iron (Fe), % 0 to 0.010
9.7 to 24.5
Manganese (Mn), % 0
0 to 1.5
Molybdenum (Mo), % 0 to 0.020
0 to 0.5
Nickel (Ni), % 0 to 0.010
0 to 4.0
Niobium (Nb), % 0 to 0.1
0 to 0.5
Nitrogen (N), % 0 to 0.010
0
Oxygen (O), % 0 to 0.030
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.0050
0.5 to 1.5
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 99.7 to 100
0
Titanium (Ti), % 0 to 0.010
0
Tungsten (W), % 0 to 0.050
0