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Commercially Pure Zirconium vs. R30012 Cobalt

Commercially pure zirconium belongs to the otherwise unclassified metals classification, while R30012 cobalt belongs to the cobalt alloys. There are 21 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is commercially pure zirconium and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 98
220
Elongation at Break, % 18
1.0
Fatigue Strength, MPa 60
320
Poisson's Ratio 0.34
0.28
Shear Modulus, GPa 36
86
Tensile Strength: Ultimate (UTS), MPa 430
830
Tensile Strength: Yield (Proof), MPa 240
650

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Specific Heat Capacity, J/kg-K 270
440
Thermal Conductivity, W/m-K 22
15
Thermal Expansion, µm/m-K 5.5
12

Otherwise Unclassified Properties

Density, g/cm3 6.7
8.8
Embodied Water, L/kg 450
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 65
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 290
960
Stiffness to Weight: Axial, points 8.1
14
Stiffness to Weight: Bending, points 23
23
Strength to Weight: Axial, points 18
26
Strength to Weight: Bending, points 19
22
Thermal Diffusivity, mm2/s 12
3.8
Thermal Shock Resistance, points 56
23

Alloy Composition

Carbon (C), % 0 to 0.050
1.4 to 2.0
Chromium (Cr), % 0 to 0.2
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Hafnium (Hf), % 0 to 4.5
0
Hydrogen (H), % 0 to 0.0050
0
Iron (Fe), % 0 to 0.2
0 to 3.0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0
0 to 3.0
Nitrogen (N), % 0 to 0.025
0
Oxygen (O), % 0 to 0.16
0
Silicon (Si), % 0
0 to 2.0
Tungsten (W), % 0
7.5 to 9.5
Zirconium (Zr), % 94.7 to 100
0