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Commercially Pure Zirconium vs. R31537 Cobalt

Commercially pure zirconium belongs to the otherwise unclassified metals classification, while R31537 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 R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 98
220
Elongation at Break, % 18
14 to 23
Fatigue Strength, MPa 60
310 to 480
Poisson's Ratio 0.34
0.29
Shear Modulus, GPa 36
87
Tensile Strength: Ultimate (UTS), MPa 430
1000 to 1340
Tensile Strength: Yield (Proof), MPa 240
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Specific Heat Capacity, J/kg-K 270
450
Thermal Conductivity, W/m-K 22
13
Thermal Expansion, µm/m-K 5.5
13

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 65
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 290
780 to 1990
Stiffness to Weight: Axial, points 8.1
15
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 18
33 to 44
Strength to Weight: Bending, points 19
26 to 32
Thermal Diffusivity, mm2/s 12
3.4
Thermal Shock Resistance, points 56
24 to 32

Alloy Composition

Carbon (C), % 0 to 0.050
0 to 0.14
Chromium (Cr), % 0 to 0.2
26 to 30
Cobalt (Co), % 0
58.9 to 69
Hafnium (Hf), % 0 to 4.5
0
Hydrogen (H), % 0 to 0.0050
0
Iron (Fe), % 0 to 0.2
0 to 0.75
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0
0 to 1.0
Nitrogen (N), % 0 to 0.025
0 to 0.25
Oxygen (O), % 0 to 0.16
0
Silicon (Si), % 0
0 to 1.0
Zirconium (Zr), % 94.7 to 100
0