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Grade 705C Zirconium vs. R31538 Cobalt

Grade 705C zirconium belongs to the otherwise unclassified metals classification, while R31538 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 R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 98
220
Elongation at Break, % 13
13 to 23
Poisson's Ratio 0.34
0.29
Shear Modulus, GPa 36
86
Tensile Strength: Ultimate (UTS), MPa 540
1020 to 1360
Tensile Strength: Yield (Proof), MPa 390
580 to 930

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
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 66
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 790
750 to 1920
Stiffness to Weight: Axial, points 8.1
15
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 22
34 to 45
Strength to Weight: Bending, points 22
27 to 32
Thermal Diffusivity, mm2/s 9.9
3.5
Thermal Shock Resistance, points 69
25 to 33

Alloy Composition

Carbon (C), % 0 to 0.1
0.15 to 0.35
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
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 1.0
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
Silicon (Si), % 0
0 to 1.0
Zirconium (Zr), % 91.9 to 98
0