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Nuclear Grade Hafnium vs. AWS ERTi-5

Nuclear grade hafnium belongs to the otherwise unclassified metals classification, while AWS ERTi-5 belongs to the titanium alloys. There are 17 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is nuclear grade hafnium and the bottom bar is AWS ERTi-5.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 78
110
Elongation at Break, % 25
10
Poisson's Ratio 0.26
0.32
Shear Modulus, GPa 31
40
Tensile Strength: Ultimate (UTS), MPa 350
900
Tensile Strength: Yield (Proof), MPa 170
830

Thermal Properties

Latent Heat of Fusion, J/g 130
410
Specific Heat Capacity, J/kg-K 140
560
Thermal Expansion, µm/m-K 5.9
9.6

Otherwise Unclassified Properties

Density, g/cm3 13
4.4

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 73
87
Resilience: Unit (Modulus of Resilience), kJ/m3 180
3250
Stiffness to Weight: Axial, points 3.3
13
Stiffness to Weight: Bending, points 11
35
Strength to Weight: Axial, points 7.4
56
Strength to Weight: Bending, points 8.4
46
Thermal Shock Resistance, points 55
63

Alloy Composition

Aluminum (Al), % 0
5.5 to 6.8
Carbon (C), % 0
0 to 0.050
Hafnium (Hf), % 99.8 to 100
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 0
0 to 0.22
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0.12 to 0.2
Titanium (Ti), % 0
88.2 to 90.9
Vanadium (V), % 0
3.5 to 4.5
Residuals, % 0 to 0.23
0