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Grade 705C Zirconium vs. R30605 Cobalt

Grade 705C zirconium belongs to the otherwise unclassified metals classification, while R30605 cobalt belongs to the cobalt alloys. There are 18 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is grade 705C zirconium and the bottom bar is R30605 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 98
210
Elongation at Break, % 13
34
Poisson's Ratio 0.34
0.29
Shear Modulus, GPa 36
81
Tensile Strength: Ultimate (UTS), MPa 540
1130 to 1900
Tensile Strength: Yield (Proof), MPa 390
470 to 1600

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Specific Heat Capacity, J/kg-K 270
410
Thermal Conductivity, W/m-K 18
9.6
Thermal Expansion, µm/m-K 5.7
12

Otherwise Unclassified Properties

Density, g/cm3 6.7
9.6
Embodied Water, L/kg 450
450

Common Calculations

Stiffness to Weight: Axial, points 8.1
12
Stiffness to Weight: Bending, points 23
21
Strength to Weight: Axial, points 22
33 to 55
Strength to Weight: Bending, points 22
25 to 36
Thermal Diffusivity, mm2/s 9.9
2.5
Thermal Shock Resistance, points 69
31 to 52

Alloy Composition

Carbon (C), % 0 to 0.1
0.050 to 0.15
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
46.4 to 57
Hafnium (Hf), % 0 to 4.5
0
Hydrogen (H), % 0 to 0.0050
0
Iron (Fe), % 0 to 0.3
0 to 3.0
Manganese (Mn), % 0
1.0 to 2.0
Nickel (Ni), % 0
9.0 to 11
Niobium (Nb), % 2.0 to 3.0
0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.010
0 to 0.040
Silicon (Si), % 0
0 to 0.4
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
14 to 16
Zirconium (Zr), % 91.9 to 98
0