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Nuclear Grade Hafnium vs. R30003 Cobalt

Nuclear grade hafnium belongs to the otherwise unclassified metals classification, while R30003 cobalt belongs to the cobalt alloys. There are 16 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is nuclear grade hafnium and the bottom bar is R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 78
210
Elongation at Break, % 25
10 to 73
Poisson's Ratio 0.26
0.29
Shear Modulus, GPa 31
83
Tensile Strength: Ultimate (UTS), MPa 350
970 to 1720
Tensile Strength: Yield (Proof), MPa 170
510 to 1090

Thermal Properties

Latent Heat of Fusion, J/g 130
310
Specific Heat Capacity, J/kg-K 140
450
Thermal Expansion, µm/m-K 5.9
13

Otherwise Unclassified Properties

Density, g/cm3 13
8.4

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 180
600 to 2790
Stiffness to Weight: Axial, points 3.3
14
Stiffness to Weight: Bending, points 11
24
Strength to Weight: Axial, points 7.4
32 to 57
Strength to Weight: Bending, points 8.4
26 to 38
Thermal Shock Resistance, points 55
26 to 45

Alloy Composition

Boron (B), % 0
0 to 0.1
Carbon (C), % 0
0 to 0.15
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
39 to 41
Hafnium (Hf), % 99.8 to 100
0
Iron (Fe), % 0
10 to 20.5
Manganese (Mn), % 0
1.5 to 2.5
Molybdenum (Mo), % 0
6.0 to 8.0
Nickel (Ni), % 0
14 to 16
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0
0 to 1.2
Sulfur (S), % 0
0 to 0.015
Residuals, % 0 to 0.23
0