Nuclear Grade (Grade R1) Hafnium
Nuclear grade hafnium is a hafnium alloy. Cited properties are appropriate for the annealed condition. It has a fairly low heat capacity and a moderately high density among alloys in the same category.
The graph bars on the material properties cards below compare nuclear grade hafnium to: hafnium alloys (top), all alloys in the same category (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
78 GPa 11 x 106 psi
Elongation at Break
25 %
Poisson's Ratio
0.26
Shear Modulus
31 GPa 4.5 x 106 psi
Tensile Strength: Ultimate (UTS)
350 MPa 51 x 103 psi
Tensile Strength: Yield (Proof)
170 MPa 25 x 103 psi
Other Material Properties
Density
13 g/cm3 830 lb/ft3
Latent Heat of Fusion
130 J/g
Specific Heat Capacity
140 J/kg-K 0.034 BTU/lb-°F
Thermal Expansion
5.9 µm/m-K
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
73 MJ/m3
Resilience: Unit (Modulus of Resilience)
180 kJ/m3
Stiffness to Weight: Axial
3.3 points
Stiffness to Weight: Bending
11 points
Strength to Weight: Axial
7.4 points
Strength to Weight: Bending
8.4 points
Thermal Shock Resistance
55 points
Alloy Composition
| Hf | 99.8 to 100 | |
| res. | 0 to 0.23 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
ASTM B737: Standard Specification for Hot-Rolled and/or Cold-Finished Hafnium Rod and Wire
ASTM B776: Standard Specification for Hafnium and Hafnium Alloy Strip, Sheet, and Plate