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Grade 27 Titanium vs. Nuclear Grade Hafnium

Grade 27 titanium belongs to the titanium alloys classification, while nuclear grade hafnium belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (14, 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 grade 27 titanium and the bottom bar is nuclear grade hafnium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
78
Elongation at Break, % 27
25
Poisson's Ratio 0.32
0.26
Shear Modulus, GPa 41
31
Tensile Strength: Ultimate (UTS), MPa 270
350
Tensile Strength: Yield (Proof), MPa 230
170

Thermal Properties

Latent Heat of Fusion, J/g 420
130
Specific Heat Capacity, J/kg-K 540
140
Thermal Expansion, µm/m-K 8.7
5.9

Otherwise Unclassified Properties

Density, g/cm3 4.5
13

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
73
Resilience: Unit (Modulus of Resilience), kJ/m3 240
180
Stiffness to Weight: Axial, points 13
3.3
Stiffness to Weight: Bending, points 35
11
Strength to Weight: Axial, points 17
7.4
Strength to Weight: Bending, points 21
8.4
Thermal Shock Resistance, points 21
55

Alloy Composition

Carbon (C), % 0 to 0.080
0
Hafnium (Hf), % 0
99.8 to 100
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.18
0
Ruthenium (Ru), % 0.080 to 0.14
0
Titanium (Ti), % 99 to 99.92
0
Residuals, % 0
0 to 0.23