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Grade 705C Zirconium vs. R30035 Cobalt

Grade 705C zirconium belongs to the otherwise unclassified metals classification, while R30035 cobalt belongs to the cobalt alloys. There are 20 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 R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 98
220 to 230
Elongation at Break, % 13
9.0 to 46
Poisson's Ratio 0.34
0.29
Shear Modulus, GPa 36
84 to 89
Tensile Strength: Ultimate (UTS), MPa 540
900 to 1900
Tensile Strength: Yield (Proof), MPa 390
300 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Specific Heat Capacity, J/kg-K 270
440
Thermal Conductivity, W/m-K 18
11
Thermal Expansion, µm/m-K 5.7
13

Otherwise Unclassified Properties

Density, g/cm3 6.7
8.7
Embodied Water, L/kg 450
410

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 66
160 to 320
Resilience: Unit (Modulus of Resilience), kJ/m3 790
210 to 5920
Stiffness to Weight: Axial, points 8.1
14 to 15
Stiffness to Weight: Bending, points 23
23 to 24
Strength to Weight: Axial, points 22
29 to 61
Strength to Weight: Bending, points 22
24 to 39
Thermal Diffusivity, mm2/s 9.9
3.0
Thermal Shock Resistance, points 69
23 to 46

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0 to 0.1
0 to 0.025
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
29.1 to 39
Hafnium (Hf), % 0 to 4.5
0
Hydrogen (H), % 0 to 0.0050
0
Iron (Fe), % 0 to 0.3
0 to 1.0
Manganese (Mn), % 0
0 to 0.15
Molybdenum (Mo), % 0
9.0 to 10.5
Nickel (Ni), % 0
33 to 37
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 0.015
Silicon (Si), % 0
0 to 0.15
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0
0 to 1.0
Zirconium (Zr), % 91.9 to 98
0