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R31538 Cobalt vs. Commercially Pure Zirconium

R31538 cobalt belongs to the cobalt alloys classification, while commercially pure zirconium belongs to the otherwise unclassified metals. 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 R31538 cobalt and the bottom bar is commercially pure zirconium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
98
Elongation at Break, % 13 to 23
18
Fatigue Strength, MPa 310 to 480
60
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 86
36
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
430
Tensile Strength: Yield (Proof), MPa 580 to 930
240

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
65
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
290
Stiffness to Weight: Axial, points 15
8.1
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 34 to 45
18
Strength to Weight: Bending, points 27 to 32
19
Thermal Diffusivity, mm2/s 3.5
12
Thermal Shock Resistance, points 25 to 33
56

Alloy Composition

Carbon (C), % 0.15 to 0.35
0 to 0.050
Chromium (Cr), % 26 to 30
0 to 0.2
Cobalt (Co), % 58.7 to 68.9
0
Hafnium (Hf), % 0
0 to 4.5
Hydrogen (H), % 0
0 to 0.0050
Iron (Fe), % 0 to 0.75
0 to 0.2
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0
Nitrogen (N), % 0 to 0.25
0 to 0.025
Oxygen (O), % 0
0 to 0.16
Silicon (Si), % 0 to 1.0
0
Zirconium (Zr), % 0
94.7 to 100