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Grade 705C Zirconium vs. R30075 Cobalt

Grade 705C zirconium belongs to the otherwise unclassified metals classification, while R30075 cobalt belongs to the cobalt alloys. There are 20 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is grade 705C zirconium and the bottom bar is R30075 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 98
210 to 250
Elongation at Break, % 13
12
Poisson's Ratio 0.34
0.29
Shear Modulus, GPa 36
82 to 98
Tensile Strength: Ultimate (UTS), MPa 540
780 to 1280
Tensile Strength: Yield (Proof), MPa 390
480 to 840

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Specific Heat Capacity, J/kg-K 270
450
Thermal Conductivity, W/m-K 18
13
Thermal Expansion, µm/m-K 5.7
12

Otherwise Unclassified Properties

Density, g/cm3 6.7
8.4
Embodied Water, L/kg 450
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 66
84 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 790
560 to 1410
Stiffness to Weight: Axial, points 8.1
14 to 17
Stiffness to Weight: Bending, points 23
24 to 25
Strength to Weight: Axial, points 22
26 to 42
Strength to Weight: Bending, points 22
22 to 31
Thermal Diffusivity, mm2/s 9.9
3.5
Thermal Shock Resistance, points 69
21 to 29

Alloy Composition

Aluminum (Al), % 0
0 to 0.1
Boron (B), % 0
0 to 0.010
Carbon (C), % 0 to 0.1
0 to 0.35
Chromium (Cr), % 0
27 to 30
Cobalt (Co), % 0
58.7 to 68
Hafnium (Hf), % 0 to 4.5
0
Hydrogen (H), % 0 to 0.0050
0
Iron (Fe), % 0 to 0.3
0 to 0.75
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0
0 to 0.5
Niobium (Nb), % 2.0 to 3.0
0
Nitrogen (N), % 0 to 0.030
0 to 0.25
Oxygen (O), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.010
0 to 0.020
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0
0 to 0.1
Tungsten (W), % 0
0 to 0.2
Zirconium (Zr), % 91.9 to 98
0